Joseph Murray & David P. Farrington: Parental imprisonment: Long lasting effects on boyÂ´s internalizing problems through the life course.
JOSEPH MURRAY AND DAVID P. FARRINGTON
University of Cambridge
Qualitative studies suggest that children react to parental imprisonment by developing internalizing as well as externalizing behaviors. However, no previous study has examined the effects of parental imprisonment on childrenâ€™s internalizing problems using standardized instruments, appropriate comparison groups, and long-term follow-up. Using prospective longitudinal data from the Cambridge Study in Delinquent Development, we compared boys separated because of parental imprisonment during their first 10 years of life with four control groups: boys who did not experience separation, boys separated because of hospitalization or death, boys separated for other reasons (usually parental disharmony), and boys whose parents were only imprisoned before the boysâ€™ births. Individual, parenting, and family risk factors for internalizing problems were measured when boys were ages 8â€“11 years. Separation because of parental imprisonment predicted boysâ€™ internalizing problems from age 14 to 48, even after controlling for childhood risk factors including parental criminality. Separation because of parental imprisonment also predicted the co-occurrence of internalizing and antisocial problems. These results suggest that parental imprisonment might cause long-lasting internalizing and antisocial problems for children.
With rapidly growing prison populations through- out the world, vast numbers of children are experiencing parental imprisonment. Provisional estimates suggest that 125,000 children under the age of 18 experience parental imprisonment each year in England and Wales (Murray, 2007). One and a half million children under the age of 18 had an incarcerated parent in the United States in 1999 (Mumola, 2000). Small- scale studies suggest that children can react to par- ental imprisonment with internalizing problems
The authors are grateful to the Home Office for funding the Cambridge Study in Delinquent Development. The first au- thor is grateful to the ESRC for financial support of his re- search. Ian Colman, Lynne Murray, and several anonymous reviewers provided helpful comments on earlier drafts of this paper.
Address correspondence and reprint requests to: Joseph Murray, Institute of Criminology, University of Cambridge, Sidgwick Avenue, Cambridge CB3 9DT, UK; E-mail: firstname.lastname@example.org.
such as sleep disturbance, bedwetting, concentra- tion problems, clinging behavior, sadness, low mood, and withdrawal (see, e.g., Boswell & Wedge, 2002; Kampfner, 1995; Sack & Seidler, 1978; Skinner & Swartz, 1989). However, as several commentators have noted (Gabel, 1992; Hagan & Dinovitzer, 1999; Murray, 2005; Parke & Clarke-Stewart, 2002), studies of prisonersâ€™ children usually do not use adequate sampling, standardized measures, suitable controls, or long-term follow-up.
It has been suggested that 30% of prisonersâ€™ children experience mental health problems during childhood and adolescence, compared to about 10% of the general population (Phil- brick, 1996). We found only one study that compared the rate of internalizing problems among prisonersâ€™ children with those experi- enced by a control group selected from a gen- eral population. Forty years ago, Friedman and Esselstyn (1965) compared 90 boys of
J. Murray and D. P. Farrington
imprisoned fathers with 154 controls, appar- ently selected from school registers. Nearly half (45%) of prisonersâ€™ children had below average â€œself-concept,â€ as rated by teachers, compared with 29 and 14% among two control groups. However, other internalizing outcomes were not measured, maternal imprisonment was taken into account, official records were not used to verify the status of the control group, and statistical tests were not used in the analy- ses. In short, virtually nothing is known from high quality studies about the risk of internaliz- ing problems for prisonersâ€™ children in the short or long term.
In this paper, we investigate whether separa- tion because of parental imprisonment predicts boysâ€™ internalizing problems through the life course using reliable measures of parental impri- sonment, well-standardized outcome measures, and several different control groups. â€œInternaliz- ing problemsâ€ refer to â€œa core disturbance in intropunitive emotions and moods (e.g., sorrow, guilt, fear, and worry)â€ (Zahn-Waxler, Klimes- Dougan, & Slattery, 2000, p. 443). We use the term â€œimprisonmentâ€ to refer to any form of cus- todial confinement, including local and training prisons (in the United Kingdom), and jail and prison (in the United States). In the following, we outline three theoretical perspectives that might explain why childrenâ€™s internalizing prob- lems develop after parental imprisonment.
The Trauma Perspective
According to attachment theory originally for- mulated by Bowlby (1969, 1973, 1980), sep- aration from a parent during childhood can negatively affect childrenâ€™s sense of security, and cause internalizing problems in the short and long term. In a much cited passage, Bowlby argued that continuous care by an attachment figure was as important to childrenâ€™s develop- ment as proper diet and nutrition (Kobak, 1999). According to this perspective, parental imprisonment might cause internalizing prob- lems for children because parentâ€“child separa- tion disrupts childrenâ€™s attachment relations.
However, two lines of research suggest that childrenâ€™s difficulties following separation from a parent are not simply caused by separa- tion per se. First, prospective longitudinal stud-
ies of children who experience parental separa- tion and divorce demonstrate that many of their problems were actually present before the di- vorce (Emery, 1999; Rutter, Giller, & Hagell, 1998). In the context of parental divorce, stress- ors other than parentâ€“child separation (includ- ing interparental conflict, strained relationships between children and custodial parents, and a decline in the standard of living) appear to have more impact on childrenâ€™s adjustment than separation itself (Amato, 1993; Emery, 1999; Rodgers & Pryor, 1998). Second, as at- tachment theory developed, Bowlby and Ains- worth emphasized that childrenâ€™s reactions to separation are significantly modified by the nature of the separation, and the quality of the attachment relationship before the separation (Kobak, 1999). They suggested that the adverse affects of parentâ€“child separation can be mitiga- ted by planning and negotiating separations, by continuing communication, and by maintaining childrenâ€™s confidence in the accessibility and responsiveness of their parent (by children hav- ing secure â€œworking modelsâ€ of their parent). Therefore, different types of parentâ€“child separation might have very different consequen- ces for children (Juby & Farrington, 2001; Rodgers & Pryor, 1998; Rutter et al., 1998).
Parental imprisonment is often unexpected and unexplained (Shaw, 1987, 1992), and some- times frighteningly violent. Childrenâ€™s highly limited access to their imprisoned parent is often strained by long-distance travel, unpleasant search procedures, and restrictive visiting envi- ronments, sometimes prohibiting physical con- tact (Brown, Dibb, Shenton, & Elson, 2002; McDermott & King, 1992; Richards et al., 1994). Therefore, although separation per se may not always cause difficulties for children, the traumatic nature of separation caused by paren- tal imprisonment may be particularly harmful.
Limited evidence to date suggests that chil- dren often show attachment-related problems following parental imprisonment. In a study of 2- to 7-year-old children with imprisoned mothers, Poehlmann (2005) found that 83% of the children cried, showed sadness, or repeat- edly called for their mothers during the first 2 weeks of separation, and 63% of them had insecureâ€“negative attachment representations of their mothers. Children were less likely to have
Parental imprisonment and boysâ€™ internalizing problemsÂ 275
such insecureâ€“negative representations when they were older and when they did not react to the initial separation with anger. In a questionnaire study with imprisoned fathers, Lanier (1993) also found that fathers reported decreased feelings of closeness with their children following im- prisonment.
However, control groups were not included in the above two studies, and there is little evidence on whether parental imprisonment has similar or worse consequences for children compared with other forms of parentâ€“child separation. Only one previous study compared internalizing problems of prisonersâ€™ children with those of children separated from parents for other reasons. Moerk (1973) found similar levels of poor self-concept among 24 boys whose fathers had been impri- soned (for at least 1 month since the boysâ€™ births) and 24 boys separated from their father because of parental divorce. However, the study was cross-sectional, and no information was reported about how parental imprisonment (or divorce) was measured.
In summary, according to the trauma per- spective, parental imprisonment might cause internalizing problems for children because it disrupts childrenâ€™s attachment relationships. Separation caused by parental imprisonment may be more harmful for children than other forms of parentâ€“child separation, because the nature of the separation during parental impri- sonment is more traumatic. In the present study, we compare internalizing outcomes of prison- ersâ€™ children and children separated from par- ents for other reasons.
The Life-Course Perspective
The life-course perspective emphasizes that other adversities often follow a life event such as parental imprisonment, and that these adver- sities might mediate the relationship between parental imprisonment and childrenâ€™s internal- izing problems. (We discuss factors preceding parental imprisonment in â€œThe Selection Per- spectiveâ€ section.)
Parental imprisonment can precipitate a loss of family income, emotional stress among chil- drenâ€™s caregivers, disrupted prisonerâ€“caregiver relationships, and house and neighborhood moves. One of the most comprehensive studies
of prisonersâ€™ families was conducted by Morris (1965), who interviewed 825 imprisoned men in England and 469 of their wives. Among the most common problems reported, 63% of wives said they experienced deterioration in their financial situation, 81% reported some deterioration in their work, 46% reported deterioration in their present attitude to mar- riage and future plans, 63% reported deteriora- tion in social activity, and 57% reported deterioration in relationships with friends and neighbors.1Â The experience of imprisonment might also reduce imprisoned parentsâ€™ capacity to care for their children when they are released. These multiple stresses might, in turn, cause internalizing problems for prisonersâ€™ children (see Garber, 2000, and Vasey & Ollendick, 2000, on the effects of social stresses on depres- sion and anxiety, respectively).
Parental imprisonment might also cause childrenâ€™s internalizing problems because of the stigma attached to it. According to several small-scale studies (Boswell & Wedge, 2002; Sack, 1977; Sack & Seidler, 1978; Sack, Seid- ler, & Thomas, 1976), children can experience stigma, bullying, and teasing because of their parentâ€™s imprisonment. These events might cause internalizing problems in the short and long term (see the review by Hinshaw & Cic- chetti, 2000, on the developmental effects of stigma in relation to mental illness).
Parental imprisonment might also have in- direct effects on childrenâ€™s internalizing prob- lems because of its effects on childrenâ€™s antiso- cial behaviors. Recently, we found that parental imprisonment during childhood predicted boysâ€™ antisocial outcomes through the life course (Murray & Farrington, 2005). Comparing boys separated because of parental imprisonment (ages 0â€“10) with boys who did not experience separation and whose parents were not impri- soned, odds ratios (ORs) for predicting anti- social personality at different ages were 8.3 at age 14 (confidence interval [CI]1â„4Â 3.3, 20.5), 12.2 at age 18 (CIÂ 1â„4Â 4.4, 33.4), and 10.6 at age 32 (CIÂ 1â„4Â 3.9, 28.9). We also found that parental
1. These figures reflect our calculations from Morrisâ€™s results. We combined all levels of deterioration, defined by Morris as â€œslight,â€ â€œsubstantial,â€ or â€œseriousâ€ (Morris, 1965, pp. 215â€“224).
J. Murray and D. P. Farrington
imprisonment was a risk factor for criminality among males and females in Sweden (Murray, Janson, & Farrington, 2007). However, the effects of parental imprisonment were not as strong in Sweden as they were in England.
The meta-analysis by Angold, Costello, and Erkanli (1999) shows that there are strong associations between antisocial behaviors and internalizing problems. Possibly, â€œconduct dis- order may set in motion a series of events in- cluding police contact, parental disapproval, and peer rejection that increase the likelihood that those who have conduct disorders will de- velop affective disordersâ€ (Fergusson, Lyns- key, & Horwood, 1996, p. 452). If this were true, childrenâ€™s antisocial behaviors might me- diate the effects of parental imprisonment on childrenâ€™s internalizing problems. In the pre- sent study, we examine whether antisocial be- haviors in adolescence mediate the relationship between parental imprisonment during child- hood and internalizing problems in adulthood, and whether parental imprisonment predicts the co-occurrence of internalizing and anti- social problems for boys.
In summary, according to the life-course perspective, parental imprisonment might pre- cipitate social and economic stresses, which might cause antisocial behavior. These stresses and antisocial behavior may, in turn, cause an increase in childrenâ€™s internalizing problems through the life course.
The Selection Perspective
A critical question is whether parental imprison- ment causes childrenâ€™s internalizing problems, as outlined above, or whether preexisting disad- vantages that are associated with parental im- prisonment cause childrenâ€™s problems. Prisoners, and therefore their families, tend to come from extremely deprived backgrounds, even before imprisonment takes place. It is possible that par- ental imprisonment is not a cause but is associ- ated with childrenâ€™s internalizing problems purely because it is associated with preexisting adversities in childrenâ€™s lives, which themselves cause internalizing problems.
Prisoners are more likely than the general population to be unemployed, to have low social class, multiple mental health problems,
many criminal convictions, marital difficulties, and their own experiences of abuse and neglect (Dodd & Hunter, 1992; Lynch, Smith, Grazia- dei, & Pittayathikhun, 1994; Singleton, Melt- zer, Gatward, Coid, & Deasy, 1998). Recently, Murray and Farrington (2005) confirmed that prisonersâ€™ children tend to experience more childhood adversities than their peers. At age 10, boys separated because of parental impri- sonment had, on average, 5.4 individual and family risk factors (such as low IQ, poor marital relations, and low family income), compared with 2.3 risk factors among boys without a his- tory of parental imprisonment or parentâ€“child separation (see also Phillips, Erkanli, Keeler, Costello, & Angold, 2006). Hence, it is impor- tant to assess whether parental imprisonment predicts adverse outcomes for children after controlling for these background risks. In the present study, we examine whether parental im- prisonment predicts boysâ€™ internalizing prob- lems after controlling for other individual and family adversities in childhood.
Stanton (1980) compared 22 children with jailed mothers and 18 children with mothers on probation to try to disentangle the effects of parental imprisonment from background ad- versities. Jailed mothersâ€™ children were more likely to be rated by teachers and counselors as having â€œlow self-esteemâ€ (59%) than proba- tion mothersâ€™ children (22%). However, the dif- ference was not statistically significant, and jail and probation mothers differed in terms of pre- vious criminal convictions, and employment and education histories, which might have been confounding factors. We located no other studies that examined whether parental impris- onment predicts childrenâ€™s internalizing prob- lems independently of background adversities.
It is also possible that prisonersâ€™ children are at genetic risk for internalizing problems before parental imprisonment takes place, as is sug- gested by Croweâ€™s (1974) adoption study. In the present study, we compare boys separated because of parental imprisonment during child- hood (ages 0â€“10) with boys whose parents were only imprisoned before their sonsâ€™ births. This comparison helps to disentangle the effects of preexisting genetic and environmental adversi- ties (which are high among children whose par- ents were imprisoned before their childâ€™s birth;
Parental imprisonment and boysâ€™ internalizing problems
Princeton University, 2002) from the effects of separation because of parental imprisonment.
In summary, very little is known about inter- nalizing problems among prisonersâ€™ children. Parental imprisonment might cause childrenâ€™s internalizing problems because of the trauma of separation, or because of other stressful ex- periences following the imprisonment. Alterna- tively, parental imprisonment might predict childrenâ€™s internalizing problems only because it reflects preexisting disadvantage. Figure 1 shows a conceptual model of these possible links between parental imprisonment and chil- drenâ€™s internalizing problems.
The Present Study
We used data collected on males in the Cam- bridge Study in Delinquent Development (CSDD) and their parents to examine the effects of parental imprisonment on boysâ€™ internalizing problems. We tested six hypotheses about the effects of parental imprisonment on boysâ€™ inter- nalizing problems through the life course.
- The first hypothesis was that parental imprison- ment in childhood (ages 0â€“10) predicts boysâ€™ internalizing outcomes through the life course.
- Drawing on the trauma perspective, we tested the second hypothesis that separation be- cause of parental imprisonment in childhood predicts more internalizing problems than parentâ€“child separation for other reasons.
Drawing on one idea from the life-course per- spective, we tested the third hypothesis that boysâ€™ antisocial personalities mediate the rela- tionship between parental imprisonment in childhood and later-life internalizing problems.
Drawing on the selection perspective, we tested the following three hypotheses:
4. Parental imprisonment before boysâ€™ births predicts similar levels of internalizing prob- lems as separation because of parental impri- sonment during childhood (ages 0â€“10).
5. Other childhood adversities associated with parental imprisonment also predict boysâ€™ internalizing problems.
6. The association between parental imprison- ment and boysâ€™ internalizing problems dis- appears after controlling for these other childhood adversities.
Participants and procedures
The CSDD is a prospective longitudinal survey of 411 males, followed up from age 8 to 48 (Farrington, 2003; Farrington et al., 2006). At the time they were first contacted in 1961 to 1962, these males were all living in a working- class innercity area of South London. The sample was chosen by taking all the boys who were then ages 8â€“9 and on the registers
J. Murray and D. P. Farrington
of six state primary schools within a 1-mile radius of a research office. Hence, the most common year of birth of these males was 1953. In nearly all cases (94%) their family breadwinner at that time (usually the father) had a working-class occupation (skilled, semi- skilled, or unskilled manual worker). Most of the males were White (97%) and of British origin. The study was originally directed by Donald J. West. Since 1982 it has been directed by David P. Farrington, who has worked on it since 1969. It has been funded mainly by the Home Office and also by the Department of Health. It is unusual for detailed information on parentsâ€™ criminal records to be collected in studies of child development, and the CSDD represents a rare opportunity to study the effects of parental imprisonment on childrenâ€™s internalizing problems.
In this article, we compare five mutually ex- clusive groups of boys according to whether their parents were imprisoned, and according to whether they were separated from a parent for other reasons. The experimental group consists of 23 boys who experienced parental imprison- ment in their first 10 years of life. The first control group consists of 227 boys who did not experi- ence any separation from a parent (of 1 month or more) in their first 10 years, and whose par- ents were not imprisoned at any time before the boysâ€™ 18th birthdays. The second control group consists of 77 boys whose parents were not im- prisoned, but who experienced separation from either parent in their first 10 years because of hospitalization (of parent or child) or parental death. The third control group consists of 61 boys whose parents were not imprisoned, but who experienced separation from either parent in their first 10 years for other reasons than hos- pitalization, death, or imprisonment (usually because of parental disharmony). The fourth control group consists of 17 boys whose parents were imprisoned before the boysâ€™ births, but not again between then and the boysâ€™ 18th birthdays.2
2. Six cases, where the boyâ€™s parent was first imprisoned between the boyâ€™s 11th and 18th birthdays, were ex- cluded from analyses because we wanted explanatory variables to be genuinely predictive of outcomes.
Measures, data reduction methods, and major findings on earlier phases of the study have been reported in four books (West, 1969, 1982; West & Farrington, 1973; West & Farrington, 1977) and in many publications, in- cluding two summary articles (Farrington, 1995, 2003).
Parental imprisonment and parentâ€“child separations
Cases of parental imprisonment were identified from searches of the central Criminal Record Office in London for findings of guilt of the boysâ€™ biological parents. Parents had to be con- victed for a relatively serious offense to have a criminal record: offenses of common assault, traffic infractions, and drunkenness are not included in these records. Social worker files were used to identify further cases of parental imprisonment for minor offenses or on remand. Parents had to have been imprisoned for at least 1 month to appear in social worker files. Four cases, where parents had only been held in cus- tody for 1 day (in lieu of a fine), were coded as â€œno parent imprisoned.â€
According to these criteria, during the boysâ€™ first 10 years of life, 20 boysâ€™ fathers were im- prisoned, two boysâ€™ mothers were imprisoned, and one boyâ€™s mother and father were impris- oned (the experimental group). The average time that these boysâ€™ parents served in prison during the boysâ€™ first 10 years of life was 9.6 months (SDÂ 1â„4Â 14.2). None of these boys was permanently separated from his parent before the imprisonment. Among the 17 boys whose parents were imprisoned only before the boysâ€™ births, 15 boys had fathers who had been impris- oned, and 2 boys had mothers who had been imprisoned. The average time that these boysâ€™ parents had served in prison was 7.8 months (SDÂ 1â„4Â 6.6).
Parentâ€“child separations for reasons other than parental imprisonment were measured in repeated interviews with the boysâ€™ parents, con- ducted by psychiatric social workers. Boys de- fined as separated from their parents because of hospitalization or death, or for other reasons, had to be separated for at least 1 month from their operative parent up to age 10 (see West Parental imprisonment and boysâ€™ internalizing problemsÂ 279
& Farrington, 1973).
The percentages of boys who were separated from their operative father up to age 10 were 74% among boys separated because of hospitalization or death and 93% among boys separated for other reasons. The percentages of boys who were separated from their operative mother up to age 10 were 75% among boys separated because of hospitaliza- tion or death and 61% among boys separated for other reasons.
Neuroticism in adolescence.Â Neuroticism is pri- marily a personality construct, which represents vulnerability to anxiety, phobic fears, obses- sional reactions, and dysthymia (Eysenck & Rachman, 1965). However, it also reflects symptoms of these internalizing problems (see Farmer et al., 2002).
Boysâ€™ neuroticism was measured at age 14 using the New Junior Maudsley Inventory (NJMI; for psychometric details, see Furneaux & Gibson, 1966). The NJMI is a 64-item ques- tionnaire, with 22 items pertaining to neuroti- cism. Respondents are asked to indicate if they feel the â€œsameâ€ or â€œdifferentâ€ to a person who states, for example, â€œI find it hard to forget my troubles.â€ Data on neuroticism were col- lected for 406 boys (99%) at age 14 using the NJMI. The reliability (aÂ or Kruderâ€“Richardson 20, which are equivalent for dichotomous data) of the NJMI neuroticism scale was .53 based on 403 respondents with no missing data.
Study malesâ€™ neuroticism was measured at age 16 using the Eysenck Personality Inventory (EPI; Eysenck, 1964). The EPI is a 62-item questionnaire, with 24 items pertaining to neu- roticism. Respondents are asked to answer â€œyesâ€ or â€œnoâ€ to questions such as, â€œDoes your mood of- ten go up and down?â€ Data on neuroticism were collected for 398 boys (97%) at age 16. The re- liability (a) of the EPI neuroticism scale was .79, based on 389 respondents with complete data.
After descriptive analyses of neuroticism scores at each age (see Table 1), an average score of neuroticism during adolescence was used for the main analyses of internalizing outcomes. The average score was calculated as the mean score of neuroticism at ages 14 and 16, after scores had been transformed into percentiles.
Anxiety and depression in adulthood.Â Anxiety and depression are the main dimensions of in- ternalizing disorders, and are highly correlated (Goldberg & Goodyer, 2005, p. 9).
Study malesâ€™ anxiety and depression (com- bined) were measured at age 32 and at age 48 using the 30-item General Health Questionnaire (GHQ; Goldberg & Williams, 1988). The GHQ measures potential psychiatric cases of anxiety and depression, with reference to symptoms over the last few weeks. Respondents are asked to indicate on a four-point scale whether they have recently â€œlost much sleep over worry,â€ for example. A total anxietyâ€“depression score was produced by summing the total number of difficulties reported by each individual. Of study males still alive at age 32 (nÂ 1â„4Â 403), 94% (nÂ 1â„4Â 378) completed the GHQ, and of those still alive at age 48 (nÂ 1â„4Â 394), 87% (nÂ 1â„4Â 342) completed the GHQ. The reliability (a) of the GHQ at age 32 was .92, based on 371 cases with complete data. The reliability (a) of the GHQ at age 48 was also .92, based on 339 cases with complete data.
After descriptive analyses of anxietyâ€“ depression scores at each age (see Table 1), an average score of anxietyâ€“depression during adulthood was used for the main analyses of internalizing problems. The average score was calculated as the mean score of the GHQ at ages 32 and 48, after scores had been trans- formed into percentiles. A log transformation was performed on the total score of internaliz- ing problems during adulthood to reduce skew- ness for parametric tests.
Antisocial personality in adolescence and adulthood.Â Antisocial personality scales, re- flecting features of conduct disorder, antisocial personality disorder, and psychopathy, were de- rived from interviews with the boys themselves, parents, teachers, and official records. For de- tails of these measures, including intercorrela- tions, see Farrington (1991).
The combined scale of antisocial personality at age 14 comprised 12 items: convicted, self-re- ported delinquency, steals outside home, regular smoking, had sex, bullies, lies frequently, lacks concentration/restless, daring, frequently dis- obedient, hostile to police, truant (aÂ 1â„4Â .75). At age 18 the antisocial personality scale (referring
280Â J. Murray and D. P. Farrington
Table 1.Â Parental imprisonment and sonsâ€™ internalizing problems
History of Parental Imprisonment and Parentâ€“Child Separation
No Separation (nÂ 1â„4Â 227)
MÂ (SD) 7.4 (3.0)
8.7 (4.3) 4.1 (4.8) 2.0 (3.7)
No Prison Separateda
(nÂ 1â„4Â 77)Â MÂ (SD)
6.8 (3.5) 8.3 (4.3) 3.3 (3.8) 2.2 (4.5)
SeparatedbÂ (nÂ 1â„4Â 61)
MÂ (SD) 7.6 (2.9)
8.3 (4.7) 5.2 (6.6) 3.1 (5.6)
(nÂ 1â„4Â 23)
Prebirth (nÂ 1â„4Â 17)
MÂ (SD) 8.1 (2.9)
10.2 (4.0) 4.1 (4.1) 1.8 (3.0)
Â Â Â Â
Neuroticism age 14 (nÂ 1â„4Â 406)
Neuroticism age 16 (nÂ 1â„4Â 398)
Anxietyâ€“depression age 32 (nÂ 1â„4Â 378)
Anxietyâ€“depression age 48 (nÂ 1â„4Â 342)
Chronic internalizing problemscÂ (n1â„4359)
9.0 (2.6) 10.3 (5.0) 6.0 (5.6) 4.8 (5.3)
aParentâ€“son separation within first 10 years of sonâ€™s life because of
bParentâ€“son separation within first 10 years of sonâ€™s life for reasons
cProblems present two or three times through the life course (problems present at both ages 14 and 16 are only counted once). Percentages show the proportion of each prison/separation group who had chronic problems.
dÂ Odds ratios comparing prison (0â€“10) with controls on chronic internalizing problems.
*pÂ ,Â 0.5. **pÂ ,Â .01. ***pÂ ,Â .001.
to the previous 3 years) comprised 14 items: convicted, self-reported delinquency, self-re- ported violence, involvement with an antisocial group, taken drugs, heavy smoking, heavy drinking, drunk driving, irresponsible sex, heavy gambling, an unstable job record, an antiestab- lishment attitude, tattooed, impulsive (aÂ 1â„4Â .74). At age 32 the antisocial personality scale (refer- ring to the previous 5 years) comprised 12 items: convicted, self-reported delinquency, involved in fights, taken drugs, heavy drinking, poor rela- tionship with parents, poor relationship with wife, divorced or child elsewhere, unemployed frequently, antiestablishment, tattooed, impul- sive (aÂ 1â„4Â .71). At age 48 the antisocial person- ality scale (referring to the previous 5 years) comprised 11 items: convicted, self-reported de- linquency, involved in fights, taken drugs, heavy drinking, poor relation with female partner, ever divorced or separated, unemployed for over 10 months, antiestablishment, impulsive, tattooed (aÂ 1â„4Â .51).
Continuous scores of internalizing and anti- social outcomes were used for most analyses in this study. However, dichotomized scores were
used for two purposes: to identify individuals who had high internalizing scores more than once in their lives, and to identify individuals who had both high internalizing and high anti- social personality scores. To identify individuals who scored highly on different scales, it was necessary to set a cut point above which partici- pants were defined as having high levels of inter- nalizing or antisocial problems. Previously, anti- social personality scales were dichotomized into the worst quarter versus the remainder in the CSDD. In the present study, we also dichoto- mized internalizing scales into the worst quarter versus the remainder, because there was a dispro- portionate number of prisonersâ€™ children in the worst quarter on these scales. For example, of children separated because of parental imprison- ment, 48% were in the upper quartile of neuroti- cism scores at age 14, but 26% were in the third quartile. Splitting the scale into five categories did not improve discrimination: 30% of prison- ersâ€™ children were in the worst quintile of neu- roticism scores at age 14, but 30% were also in the fourth quintile. As well as equating sensitiv- ity, dichotomous variables simplify the presenta-
hospitalization or death.
other than hospitalization, death, or imprisonment.
Parental imprisonment and boysâ€™ internalizing problemsÂ 281
tion of results, and do not necessarily cause a decrease in measured strength of associations (Farrington & Loeber, 2000).
Individual, parenting, and family risk factors were measured when boys were ages 8â€“11. Because childhood adversities were measured after most occurrences of parental imprison- ment these data do not enable us to distinguish whether childhood adversities had selection or mediating effects on the relationship between parental imprisonment and childrenâ€™s internal- izing problems.
Scores of childhood adversities were dichot- omized into the worst quarter versus the re- mainder to equate sensitivity with dichotomous variables of parental imprisonment. Because most family risk factors were measured in two, three, or four categories, dichotomization did not result in a great loss of information. Dichotomization seemed preferable to assum- ing that a variable with three or four categories constituted an interval scale.
Junior school attainment was measured by arithmetic, English, and verbal reasoning tests, and nonverbal IQ was measured using Ravenâ€™s Progressive Matrices Test. The boysâ€™ parents provided details about such things as their fam- ily income, the social class of the family bread- winner, and their degree of supervision of the boy. Harsh attitudes of mothers and fathers refer to combined measures of cruel, passive or neglecting attitudes, and harsh or erratic discipline. Anxiety/depression of fathers and mothers refer to combined measures of the parentsâ€™ nervousness and psychiatric treatment (and a neuroticism questionnaire in the case of mothers). Further details of these and other childhood risk factors in the CSDD can be found in West and Farrington (1973).
To test whether parental imprisonment is an independent predictor of internalizing problems, it is important to disentangle the effects of paren- tal antisocial behavior and criminality from the effects of parental imprisonment. In the present study, we counted criminal convictions of mothers and fathers up to when boys were age 10 to create a continuous variable called â€œparen- tal convictions.â€ Most (74%) imprisoned parents
had multiple (two or more) convictions, com- pared with a small minority (8%) of nonprisoner parents. To account for different levels of paren- tal criminality prior to imprisonment, we con- trolled for â€œparental convictionsâ€ on an interval scale in regression analyses.
First, we examined whether separation because of parental imprisonment predicted boysâ€™ internaliz- ing outcomes, chronic internalizing outcomes, and co-occurrence of internalizing and antisocial outcomes. Second, we examined whether the association between parental imprisonment dur- ing childhood and internalizing outcomes in adulthood was mediated by antisocial behavior in adolescence. Third, we investigated which other childhood adversities predicted boysâ€™ inter- nalizing problems. Fourth, we tested whether separation because of parental imprisonment was an independent predictor of boysâ€™ internaliz- ing problems, controlling for other childhood adversities and parental criminality, using ordi- nary least squares (OLS) regression.
It is possible that, for some children, parental imprisonment reduces stress and improves their mental health, but we predicted, on average, that children would be negatively affected by parental imprisonment. Because our hypoth- eses were unidirectional, we used one-tailed tests of statistical significance.
Parental imprisonment as a risk factor for boysâ€™ internalizing problems
Separation because of parental imprisonment predicted boysâ€™ internalizing problems through the life course (Table 1). For example, boys who were separated because of parental im- prisonment in their first 10 years of life had a higher mean level of anxietyâ€“depression at age 48 (MÂ 1â„4Â 4.8,Â SDÂ 1â„4Â 5.3) than all four com- parison groups (MsÂ 1â„4Â 2.0, 2.2, 3.1, and 1.8).
We tested whether boys who were separated because of parental imprisonment (0â€“10) had significantly higher levels of internalizing problems in adolescence (using the combined scale of neuroticism at ages 14 and 16) and higher levels of internalizing problems in adult-
J. Murray and D. P. Farrington
hood (using the combined scale of anxietyâ€“ depression at ages 32 and 48) compared with the four comparison groups.
- Boys separated because of parental imprison- ment (0â€“10) had higher levels of internalizing problems in adolescence (tÂ 1â„4Â 2.69,Â dfÂ 1â„4Â 248,Â pÂ ,Â .01) and internalizing problems in adulthood (tÂ 1â„4Â 3.59,Â dfÂ 1â„4Â 29.9,Â pÂ ,Â .001, equal variances not assumed) than boys who did not experience any form of separation.
- Boys separated because of parental impris- onment (0â€“10) had higher levels of inter- nalizing problems in adolescence (tÂ 1â„4Â 3.32,Â dfÂ 1â„4Â 45.1,Â pÂ ,Â .001, equal variances not assumed) and in adulthood (tÂ 1â„4Â 4.16,Â dfÂ 1â„4Â 45.3,Â pÂ ,Â .001, equal variances not assumed) than boys who were separated because of hospitalization or death.
- Boys separated because of parental impris- onment (0â€“10) had higher levels of inter- nalizing problems in adolescence (tÂ 1â„4Â 2.31,Â dfÂ 1â„4Â 82,Â pÂ ,Â .05) and in adulthood (t1â„41.95,df1â„477,p,.05)thanboyswho had been separated for other reasons (usually parental disharmony).
- Comparedwithboyswhoseparentswereonly imprisoned before their births, boys separated because of parental imprisonment (0â€“10) did not have significantly higher levels of inter- nalizing problems in adolescence (tÂ 1â„4Â .48,Â df1â„438,p1â„4.32),althoughtheydidhave significantly higher levels of internalizing problems in adulthood (tÂ 1â„4Â 2.03,Â dfÂ 1â„4Â 21.8,Â pÂ ,Â .05, equal variances not assumed).These findings show that parental imprison-
ment was a risk factor for boysâ€™ internalizing problems through the life course.
Parental imprisonment and chronic internalizing problems
For the whole sample of boys, internalizing scales at all four ages were significantly intercor- related(14vs.16,r1â„4.35,p,.01;14vs.32,Â r1â„4.19,p,.01;14vs.48,r1â„4.16,p,Â .01;16vs.32,r1â„4.19,p,.01;16vs.48,r1â„4.11,p,.05;32vs.48,r1â„4.21,p,.01). Next, we investigated whether separation be- cause of parental imprisonment predicted
chronic internalizing problems for boys. Chro- nicity was defined by having an internalizing problem that was present two or three times dur- ing the life course: during adolescence (age 14 or 16), at age 32, or at age 48 (problems present at both ages 14 and 16 were only counted once). At each age, â€œinternalizing problemsâ€ were defined as being in the worst quarter on internalizing scores.
Overall, 20% of boys (out of 359) suffered chronic internalizing problems through the life course. Boys separated because of parental im- prisonment had higher rates of chronic internal- izing problems than all four control groups (Table 1). Of boys separated because of parental imprisonment, 55% experienced chronic inter- nalizing problems, compared with: 18% of boys who did not experience separation (ORÂ 1â„4Â 5.7, CIÂ 1â„4Â 2.6, 12.2), 16% of boys separated because of hospitalization or death (ORÂ 1â„4Â 6.4, CIÂ 1â„4Â 2.7, 15.6), 23% of boys separated for other reasons (OR1â„4Â 4.1, CIÂ 1â„4Â 1.7, 9.9), and 21% of boys whose parents were only imprisoned be- fore their births (ORÂ 1â„4Â 4.4, CIÂ 1â„4Â 1.2, 15.8).
Parental imprisonment and the co-occurrence of internalizing and antisocial problems
For the whole sample of boys, scales of internalizing and antisocial problems were positively, but only weakly, related (age 14,Â r1â„4.13,p,.01;age16â€“18,r1â„4.08,p1â„4.05; age32,r1â„4.27,p,.001;age48,r1â„4.21,Â pÂ ,.001). We tested whether separation be- cause of parental imprisonment predicted the co-occurrence of internalizing and antisocial problems compared with the four control condi- tions. At each age, co-occurrence was defined by being in the worst quarter on internalizing scores and in the worst quarter on antisocial per- sonality scores. The proportions of all boys (nÂ 1â„4Â 392) who had both internalizing and antisocial problems at ages 14, 16â€“18, 32, and 48 were 7, 7, 10, and 5%, respectively.
Table 2 shows that separation because of par- ental imprisonment was a strong predictor of the co-occurrence of internalizing and antisocial problems through the life course. Of boys sepa- rated because of parental imprisonment (0â€“10), 68% had co-occurring internalizing and anti- social problems at some point in their lives
Parental imprisonment and boysâ€™ internalizing problemsÂ 283
(between ages 14 and 48), compared with 16% of boys who did not experience separation. Com- paring boys separated because of parental im- prisonment (0â€“10) with the four control groups, all four ORs for co-occurring internalizing and antisocial problems (at any age) were large (.4) and significant. The ORs were 11.2 (CIÂ 1â„4Â 5.0, 25.1) in comparison with boys who did not experience any form of separation, 10.9 (CIÂ 1â„4Â 4.4, 27.1) in comparisons with boys separated because of hospitalization or death, 5.9 (CIÂ 1â„4Â 2.4, 14.4) in comparison with boys separated for other reasons, and 4.3 (CIÂ 1â„4Â 1.3, 13.8) in comparison with boys whose parents were only imprisoned before their births.
Given that parental imprisonment predicted antisocial personality during adolescence (see Murray & Farrington, 2005) and internalizing problems in adulthood (see above), sonsâ€™ antisocial personality might have mediated the relationship between parental imprisonment during childhood and internalizing problems in adulthood. We conducted a formal test of this mediation model using the technique pro- posed by Baron and Kenny (1986). We used continuous scales of antisocial personality in adolescence (age 14) and internalizing prob- lems in adulthood (combined scale, ages 32 and 48), and a dichotomous measure of parental
imprisonment during childhood (coded â€œ1â€ if boys were separated because of parental im- prisonment during their first 10 years, and â€œ0â€ if boysâ€™ parents were never imprisoned).
First, we regressed internalizing problems on parental imprisonment. In this model (R2Â 1â„4Â .023,Â FÂ 1â„49.64,Â pÂ ,Â .01), parental imprison- ment significantly predicted internalizing prob- lems (bÂ 1â„4Â .16,Â tÂ 1â„43.11,Â pÂ ,Â .01). Second, we regressed antisocial personality on parental im- prisonment. In this model (R2Â 1â„4Â .085,Â FÂ 1â„4Â 35.84,Â pÂ ,Â .001), parental imprisonment signif- icantly predicted antisocial personality (bÂ 1â„4Â .29,Â tÂ 1â„4Â 5.99,Â pÂ ,Â .001). Third, we regressed inter- nalizing problems on antisocial personality. In this model (R2Â 1â„4Â .009,Â FÂ 1â„4Â 3.36,Â pÂ ,Â .05), anti- social personality significantly predicted inter- nalizing problems (bÂ 1â„4Â .09,Â tÂ 1â„4Â 1.83,Â pÂ ,Â .05). Fourth, we regressed internalizing prob- lems on both parental imprisonment and antiso- cial personality. In this model (R2Â 1â„4Â .028,Â F1â„4Â 5.25,Â pÂ ,Â .01), antisocial personality didÂ notÂ significantly predict internalizing problems (bÂ 1â„4Â .05,tÂ 1â„4Â 0.93,Â pÂ 1â„4Â .18), and the effect of par- ental imprisonment remained significant, with a similar effect size (bÂ 1â„4Â .15,Â tÂ 1â„4Â 2.70,Â pÂ ,Â .01). Therefore, antisocial personality did not mediate the relationship between parental impri- sonment and sonsâ€™ internalizing problems.
Table 2.Â Parental imprisonment and the co-occurrence of internalizing and antisocial problems in sons
Sonsâ€™ Co-occur. Internal. & Antisoc. Prob.
Age 14 (nÂ 1â„4Â 400) Age 16â€“18 (nÂ 1â„4Â 381) Age 32 (nÂ 1â„4Â 372) Age 48 (nÂ 1â„4Â 342) Any age (nÂ 1â„4Â 377)cORd
No Prison Separateda
(nÂ 1â„4Â 77) 5.3%
7.1% 5.5% 2.9%
Prison Prebirth 0â€“10
(n1â„417) (n1â„423) 13.1% 12.5% 17.4%
5.0% 20.0% 28.6% 14.8% 6.7% 33.3% 8.5% 7.1% 18.2% 26.8% 33.3% 68.2%
History of Parental Imprisonment and Parentâ€“Child Separation
No Separation (nÂ 1â„4Â 227)
4.0% 4.2% 7.2% 3.8%
SeparatedbÂ (nÂ 1â„4Â 61)
Note:Â Percentages show the proportion of each prison/separation group who had co-occurring problems.
aParentâ€“son separation within first 10 years of sonâ€™s life because of hospitalization or death.
bParentâ€“son separation within first 10 years of sonâ€™s life for reasons other than hospitalization, death, or imprisonment.Â cCases with two or more missing values were excluded from this group.
dÂ Odds ratios comparing prison (0â€“10) with controls on co-occurring problems at any age.
Chi-square tests comparing prison (0â€“10) and controls: *pÂ ,Â .05. **pÂ ,Â .01. ***Â pÂ ,Â .001.
Other childhood adversities and boysâ€™ internalizing problems
Because parental imprisonment is associated with so many other childhood adversities (Mur- ray & Farrington, 2005; Phillips et al., 2006), it is important to establish if parental imprison- ment predicts childrenâ€™s outcomes indepen- dently of associated risks. Using the whole sample of boys, we investigated which child- hood adversities (other than parental imprison- ment) were risk factors for boysâ€™ internalizing outcomes. Ten childhood adversities in the CSDD were previously identified as important predictors of boysâ€™ antisocial behavior: low nonverbal IQ, low junior school attainment, poor parental supervision of the boy, harsh atti- tudes of mothers and fathers, anxiety/depres- sion of mothers and fathers, poor marital rela- tions, low social class, and low family income. According totÂ tests, six of these child- hood adversities significantly predicted boysâ€™ internalizing problems: low IQ, low junior at- tainment, poor supervision of the boy, poor marital relations, low social class, and low fam- ily income (Table 3). The other four childhood adversities were not significantly related to boysâ€™ internalizing problems.
We tested which factors independently pre- dicted boysâ€™ internalizing outcomes by entering childhood adversities that were significant inÂ tÂ tests into OLS regression models. Internalizing problems in adolescence were independently predicted by low IQ (bÂ 1â„4Â .20,Â tÂ 1â„4Â 1.72,Â pÂ ,Â .05), poor marital relations (bÂ 1â„4Â .10,Â tÂ 1â„4Â 1.78,Â pÂ ,Â .05), and low social class (bÂ 1â„4Â .08,Â tÂ 1â„4Â 1.48,Â pÂ ,.10).3Â Internalizing problems in adulthood were independently predicted by low junior attainment (b1â„4Â .09,Â tÂ 1â„4Â 1.63,Â pÂ 1â„4Â .05) and low family income (bÂ 1â„4Â .07,Â tÂ 1â„4Â 1.26,Â pÂ 1â„4Â .10).
In addition, boysâ€™ internalizing problems were significantly, but only weakly, correlated with the number of times their parents were convicted up to when boys were age 10 (rÂ 1â„4Â .14,Â pÂ ,Â .01 for internalizing problems in
3. Wereportindependentpredictorsthatweresignificantat either .05 or .10Â aÂ levels, to identify childhood adversi- ties that might have weak influences on childrenâ€™s out- comes, but could still act as confounds between parental imprisonment and childrenâ€™s outcomes.
J. Murray and D. P. FarringtonÂ adolescence;Â rÂ 1â„4Â .13,Â pÂ ,Â .01 for internalizing
problems in adulthood).
Parental imprisonment as an independent risk factor
We investigated whether separation because of parental imprisonment predicted boysâ€™ internal- izing problems independently of parental con- victions and other childhood risk factors. We compared boys who were separated because of parental imprisonment with the four control groups in turn, controlling for parental convic- tions, and controlling for the childhood risk fac- tors identified above, using OLS regression.
Separation because of parental imprison- ment (0â€“10) had small to moderate effects on boysâ€™ internalizing problems in adolescence, even after controlling for parental convictions (Model 1, Table 4). Effect sizes for parental im- prisonment were statistically significant in comparison with separation because of hospita- lization or death (bÂ 1â„4Â .36,Â pÂ ,Â .01), and in comparison with separation for other reasons (bÂ 1â„4Â .28,Â pÂ ,Â .05). Therefore, separation be- cause of parental imprisonment did not predict sonsâ€™ internalizing problems purely because prisoners were highly criminal; imprisonment had an independent effect. After controlling for low IQ, poor marital relations, and low social class (as well as parental convictions), separation because of parental imprisonment (0â€“10) still significantly predicted internalizing problems in adolescence compared with sep- aration because of hospitalization or death (bÂ 1â„4Â .32,Â pÂ ,Â .05) and separation for other rea- sons (bÂ 1â„4Â .28,Â pÂ ,Â .05; Model 2, Table 4). In fact, effect sizes for separation because of par- ental imprisonment (0â€“10) remained very sim- ilar in all four comparisons before and after controlling for low IQ, poor marital relations, and low social class (Models 1 and 2, Table 4). These results suggest that the association be- tween parental imprisonment and internalizing problems in adolescence was not explained by prisonersâ€™ children having criminal parents, lower IQs, their parents having worse marital relations, or having low social class.
Table 5 shows the effects of separation be- cause of parental imprisonment on internalizing problems in adulthood after controlling for
Parental imprisonment and boysâ€™ internalizing problems
Table 3.Â Childhood adversities as predictors of boysâ€™ internalizing problems
Dichotomous Predictor Variable
tÂ Test Regressiona
,.01 .10 .04 .05 .04 .03 .27Â ,.01 .02 .04 .24 .17
,.01 .10 .04 .03Â ,.01 .08 .07 .06 .10 â€” â€” .02
Â Â Â Â
Low junior attainment Poor parental supervision Poor marital relations Low family SES
Low family income
.04 .25 .09 .05 â€” â€” .07 .12 â€” â€” .07 .10
Notes:Â SES, socioeconomic status.
aOnly variables that were significant inÂ tÂ tests were entered into ordinary least squares (OLS) regression models.
parental criminality and other childhood adver- sities, using OLS regression. Compared to all four control groups, separation because of par- ental imprisonment (0â€“10) predicted more in- ternalizing problems in adulthood, even after controlling for parental convictions (Model 1, Table 5). Effect sizes were small to moderate in these four comparisons (bÂ 1â„4Â .20,Â pÂ ,Â .05;b1â„4.48,p,.01;b1â„4.22,p1â„4.08;b1â„4Â .33,Â pÂ ,Â .05). Therefore, imprisonment had an independent effect. Compared to all four control groups, separation because of parental imprisonment (0â€“10) also predicted more inter-
Table 4.Â Parental imprisonment as an independent predictor of sonsâ€™ internalizing problems in adolescence
nalizing problems in adulthood, even after controlling for low junior school attainment and low family income (Model 2, Table 5). Effect sizes remained small to moderate in all four comparisons (bÂ 1â„4Â .18.pÂ ,Â .05;Â bÂ 1â„4Â .47,Â p,.01;b1â„4.24,p1â„4.07;b1â„4.33,p,.05). Hence, the association between separation be- cause of parental imprisonment and sonsâ€™ inter- nalizing problems in adulthood was not entirely explained by prisonersâ€™ children having crim- inal parents, low junior attainment, or low-in- come families. Again, parental imprisonment had an independent effect.
Table 5.Â Parental imprisonment as an independent predictor of sonsâ€™ internalizing problems in adulthood
Â Â Â
Parental Imprisonment (0â€“10) Versus
No prison, no separation No prison, separation due
No prison, separation for
other reasons Parental imprisonment
Parental Imprisonment (0â€“10) Versus
No prison, no separation No prison, separation
due to hospital/death No prison, separation for
other reasons Parental imprisonment
bÂ pÂ .20 .02 .48Â ,.01 .22 .08 .33 .03
bÂ pÂ .18 .03 .47Â ,.01 .24 .07 .33 .03
Â Â Â
.06 .38 .03
bÂ pÂ .10 .17 .32 .01 .28 .05
Â Â Â Â Â
Note:Â Variables in Model 1: parental imprisonment, paren- tal convictions; variables in Model 2: parental imprison- ment, parental convictions; boysâ€™ low IQ, poor marital relations, low social class.
Note:Â Variables in Model 1: parental imprisonment, paren- tal convictions; variables in Model 2: parental imprison- ment, parental convictions; boysâ€™ low junior school attainment, low family income.
J. Murray and D. P. Farrington
This study investigated the effects of parental imprisonment on boysâ€™ internalizing problems through the life course, using prospective lon- gitudinal data from the CSDD. Parental im- prisonment in the boysâ€™ first 10 years of life pre- dicted internalizing problems in adolescence and adulthood compared with four control con- ditions. Hence, parental imprisonment was a risk factor for sonsâ€™ internalizing problems. Separation because of parental imprisonment also predicted boysâ€™ internalizing problems after controlling for other childhood risk factors measured in the study. Hence, parental im- prisonment was an independent risk factor for boysâ€™ internalizing problems.
According to the trauma perspective, parental imprisonment might cause childrenâ€™s internaliz- ing problems because it disrupts childrenâ€™s at- tachment relationships. Parental imprisonment predicted worse internalizing outcomes than other forms of parentâ€“child separation in this study, even after controlling for other risk fac- tors. The results indicate that the particularly traumatic separation of parental imprisonment might cause internalizing problems for children.
According to the life-course perspective, par- ental imprisonment impacts on children because of other stressful experiences that often follow it, such as economic loss; school, house, and neigh- borhood moves; strained parenting by childrenâ€™s remaining caregivers; stigma; and adverse con- sequences of childrenâ€™s own antisocial behav- iors. We were unable to investigate many of these possible mechanisms. However, we were able to test whether childrenâ€™s antisocial behav- iors mediated the effects of parental imprison- ment on their later internalizing outcomes.
Prisonersâ€™ children were more likely than their peers to show both internalizing and anti- social problems throughout their lives. This is an important finding because there have been few attempts to identify which family factors precede co-occurrence of internalizing and anti- social disorders (Marmorstein & Iacono, 2004). However, antisocial behavior in adolescence did not mediate the relationship between paren- tal imprisonment and sonsâ€™ internalizing prob- lems in this study. It is possible that childrenâ€™s antisocial behavior might have increased their internalizing problems earlier in childhood
(see Gilliom & Shaw, 2004), but we were unable to test this hypothesis.
According to the selection perspective, par- ental imprisonment predicts internalizing prob- lems because prisonersâ€™ children are already disproportionally disadvantaged, not because parental imprisonment causes problems for children. Previously we found that prisonersâ€™ sons experienced high levels of individual and family adversities compared to their peers (Murray & Farrington, 2005). In the present study, several of these childhood adversities also predicted childrenâ€™s internalizing out- comes, consistent with the selection perspec- tive. However, in several tests, separation because of parental imprisonment predicted childrenâ€™s internalizing problems even after sta- tistically controlling for other childhood adver- sities. This was inconsistent with the selection perspective. In addition, parental imprisonment during childhood predicted more internalizing problems than parental imprisonment before boysâ€™ births. This also suggests that the experi- ence of parental imprisonment might be harm- ful for children, over and above the effects of background disadvantage.
In conclusion, parental imprisonment appeared to have an independent effect on childrenâ€™s in- ternalizing problems through the life course. However, further tests are required to discover if childrenâ€™s problems following parental im- prisonment are influenced more by the traumatic experiences of parental imprisonment itself, or by other life adversities that often follow paren- tal imprisonment.
Other interpretations of these results should be considered. First, with small numbers of prisonersâ€™ children (nÂ 1â„4Â 40) statistical conclu- sions are less reliable. Second, we were unable to test whether prisonersâ€™ children had worse internalizing problems than their peers before imprisonment took place. Although we con- trolled for childhood adversities associated with parental imprisonment, it is still possible that boys separated because of parental impri- sonment had elevated internalizing problems before their parents were imprisoned, or that un- measured environmental differences accounted
Parental imprisonment and boysâ€™ internalizing problemsÂ 287
for their outcomes. Therefore, causal conclusions must be extremely tentative. Third, twin and adoption studies are needed to investigate to what extent the effects of separation caused by parental imprisonment might be genetic. Fourth, because of small numbers, we were un- able to test potential protective factors among boys who experienced parental imprisonment. Fifth and finally, imprisonment was measured in England among parents of White males be- tween 1953 and 1964. Since then, prison popu- lations have grown dramatically. The propor- tion of prisoners in England and Wales with long-term sentences has increased; the propor- tion of women in prison has grown (Morgan, 1997) and, over the last decade, the Black and ethic minority prison population increased by 124% (Home Office, 2004). In the United States, imprisonment rates grew by more than 200% between 1980 and 1996, with a dramatic increase in the rate of imprisonment of drug of- fenders, ethnic minorities, and women (Blum- stein & Beck, 1999). Replication studies are re- quired to establish whether results from the present study apply to todayâ€™s prison popula- tions in the United Kingdom and in other juris- dictions.
Nevertheless, this is the first prospective longitudinal study of the effects of parental im- prisonment on childrenâ€™s internalizing prob- lems. Major strengths of this study are: the long period of follow-up, the low rates of attri- tion, and the use of well-validated measures, appropriate comparison groups, and controls for several possible confounds.
Prisonersâ€™ children are likely to be dispro- portionately represented in clinical populations (Phillips, Burns, Wagner, Kramer, & Robbins, 2002). The clinical implications of this study are that, as well as prisonersâ€™ children facing elevated risk for antisocial problems (Murray & Farrington, 2005), they are also at increased risk for internalizing problems throughout their lives. In fact, prisonersâ€™ children are more likely to have co-occurring antisocial and internaliz- ing problems than their peers. Unfortunately, the comorbidity of problems such as conduct disorder and depression indicates serious social maladjustment for children (Goodwin & Ham- ilton, 2003; Marmorstein & Iacono, 2003). In addition, internalizing problems among prison-
ersâ€™ children seem particularly chronic. Early intervention is needed to prevent severe and long-lasting social and emotional difficulties among prisonersâ€™ children (see Murray & Far- rington, 2006, on evidence-based programs for prisonersâ€™ children).
In agreement with Bronfenbrennerâ€™s (1979) thesis that macrosocial policies influence child development, the results suggest that the policy of imprisoning criminals has adverse effects on their childrenâ€™s mental health. There are many alternatives to imprisonment following convic- tion (such as community sentences, use of elec- tronic tagging, fines, and restorative justice agreements). The effects of imprisonment on communities, families, and children are rarely taken into account when calculating the costs and benefits of imprisonment. Therefore, im- prisonment continues to be used without appro- priate, rational appraisal of its overall utility. It is imperative that policy makers are informed of the long-lasting effects of imprisonment on children (and other relatives), so that the bene- fits of alternative sentences are recognized, and better support services can be provided to families of prisoners if needed. It is possible that the harmful effects of parental imprisonment on children could be mitigated by family- friendly visiting practices in prisons, economic and social support provided to prisonersâ€™ fami- lies, and less stigmatizing judicial policies and public opinion concerning offenders, such as in Sweden (Murray et al., 2007).
Developmental psychopathology has stead- ily increased our knowledge of the course and sequelae of high-risk conditions (Cicchetti, 1990). To further advance understanding of the risks associated with parental imprisonment, there is a need for replication studies, ideally controlling for childrenâ€™s adjustment prior to parental imprisonment, and additional investi- gation of the factors intervening between parental imprisonment and childrenâ€™s malad- justment. In particular, there is a need for large-scale studies with frequent measurement of childrenâ€™s outcomes that examine the more subtle dimensions of parental imprisonment: the meanings that children attribute to the event, the experiences of stigma and social isolation that might follow parental imprison- ment, and family dynamics before, during,
J. Murray and D. P. Farrington
and after parental imprisonment. In addition, to help identify potentially effective interven- tions, there is a need to investigate factors, such as social support, that might buffer the effects of parental imprisonment on children. There is also a need to know whether there are different effects of parental imprisonment on girls, children of different ages, children of different ethnicities, and children experi-
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