Methods
Scoping Reviews
As opposed to systematic reviews, scoping reviews are broader in scope and aim to map the extent and nature of research activity in a field, which enables the identification of research gaps, as well as areas where more narrowly focussed systematic reviews may be viable (
Arskey & O’Malley, 2005). Scoping reviews can summarize and disseminate key research findings, but do not generally include an appraisal of the quality of the evidence reported.
Protocol and Registration
All review methods were determined a priori and written into a protocol
, before commencing literature searches and screening. While registration was attempted, PROSPERO was not accepting scoping review protocols at that time. The original protocol can be provided by the corresponding author on request. The review follows the reporting guidelines outlined in the PRISMA Extension for Scoping Reviews (PRISMA-ScR) Checklist (see
Supplementary Appendix A).
Eligibility Criteria
The following selection criteria were used to determine whether to include or exclude studies identified by the search strategy.
Participants
Participants included children/youth with a history of child maltreatment and youth offending. Studies inclusive of offending between the ages of 8–21 years of age were included with a view to capturing research that examined juvenile justice involvement across diverse jurisdictions and offending behaviour among youth transitioning from out-of-home care (OOHC). Studies may have compared maltreated and offending youth with other groups, for instance, non-maltreated offending youth or maltreated non-offending youth. Studies included both male and female child/youth participants, while studies including only female or only male participants were excluded.
Because this review focused on youth offending, studies that included only adult participants were excluded. For example, studies were excluded if they only reported on the relationship between childhood maltreatment/child protection involvement and adult crime/criminal justice involvement. Where studies included both youth and adult participants, they were only included when the majority of the participants were under the age of 18 or where sub-analyses separating age cohorts were included.
Settings
Eligible settings included, but were not limited to, juvenile justice, child welfare, education, homelessness and health settings. Studies that used surveys or questionnaires, and relevant studies that analysed administrative or other data relating to the target participants were also included.
Study designs
Studies must have reported on an empirical primary research study relating to the intersection between child maltreatment (either self-report or as indicated by child protection involvement as a proxy) and youth offending (crime and/or youth justice system involvement). Studies that used either quantitative or qualitative methods were eligible for inclusion. Definitions of child maltreatment were inclusive of self-report measures (including adverse childhood experiences (ACE) scales and via standardized instruments such as the Childhood Trauma Questionnaire), as well as administrative data (e.g. child protection substantiations and court records). While child protection system involvement does not always relate to experiences of abuse and neglect, a large body of studies in the maltreatment-youth offending field have utilized protective services’ administrative data as a proxy measure of child maltreatment. Similarly, definitions of youth offending were inclusive of self-report as well as official records/indicators (e.g. youth convictions or sentences). Studies must also have included an assessment or analysis of sex/gender differences of relevant outcomes relating to children who experience child maltreatment and youth offending.
Measures of interest
This review aimed to capture studies that described gender/sex differences in measures relating to the relationship between child maltreatment and youth offending. Given the expectation that there would be few studies that report a gender analysis, this review included studies that reported on a range of measures. These included, but were not restricted to, the following:
•
Child/youth characteristics: for example, age, race/ethnicity, mental health and disability diagnoses.
•
Child/youth maltreatment experiences: for example, types of maltreatment, experiences of multi-type maltreatment and maltreatment recurrence/persistence.
•
Child/youth child protection pathways: for example, age at first child protection notification/substantiation, age at first OOHC placement, placement stability and placement types.
•
Child/youth offending: any offending/convictions, offence types and violent offending.
Studies solely reporting measures relating to aggression, antisocial or externalizing behaviour, and substance misuse, rather than specific offending among children and young people of the age of criminal responsibility, were not included. Additionally, as this review is primarily interested in examining gender differences in the childhood maltreatment (by caregivers or other adults)-youth offending nexus, studies solely including victimization in the context of romantic relationships (or ‘dating violence’) were excluded.
Sources of evidence
The review included evidence from both published and non-published sources. There were no limits placed on the language or year of publication.
Literature Search Strategy
An electronic search strategy was designed to identify studies that reported on gender differences in the characteristics, child protection pathways and offending of child protection-involved youth. Keywords relating to “youth” (e.g. child, minor and adolescent), “maltreatment” (e.g. abuse, neglect and trauma), “child protection” (e.g. child welfare, looked after and foster care), “offending” (e.g. delinquency, crime and recidivism) and “gender” (e.g. male, female, sexes) were used to search the following electronic databases in November 2020): (1) Ovid MEDLINE(R), Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations, Ovid MEDLINE(R) Daily and Ovid OLDMEDLINE(R) (1946 to present); (2) Criminal Justice Abstracts via Ebsco (1980 to present);(3) ProQuest: Social Sciences Premium Collection (1914 to present) and (4) CINCH—Australian Criminology Database (1882 to present). Text word searches were mapped verbatim into each database, excepting adjustments made for database specific syntax. The reference lists of systematic reviews identified by the search strategy were also hand searched for additional eligible primary studies.
Data Management and Software
Reference management software
EndNote X8 (
Clarivate Analytics, 2018) was used to compile all titles and abstracts derived from the search strategy, and duplicates were removed. All citations were then transferred to systematic review software
Covidence to undertake title/abstract and full text screening of studies and to identify, track and resolve discrepancies across reviewers.
Study Selection
Prior to study selection, all review authors underwent training to ensure a comparable understanding of the purpose of the review and the selection criteria. Titles and abstracts retrieved from the electronic searches were screened to exclude publications that did not meet the selection criteria. This stage of the screening process was highly inclusive, and a full text review was undertaken when the information provided in the titles and abstracts was unclear or insufficient. All 11,568 titles and abstracts were screened by one author (A1) and 26.1% in total were screened by the other two authors (A2 and A3). Consensus was reached by a discussion between authors in cases of conflict.
For the full text review, each study was assessed by one review author (A1), and 24.7% duplicate assessments were performed independently by the other two reviewers (A2 and A3). There was an 86% agreement rate between screeners for duplicate screened text. Discrepancies were again discussed within the research team until a consensus was reached.
Data Charting Process and Items
A data extraction form was developed a priori, and one reviewer extracted the data (A1). The following data items were extracted: study characteristics (e.g., authors, year published, country and publication type); study purpose/aims; methods; study design; participant information (including population, sample size, % male); maltreatment measures and offending measures. A summary of key analyses by gender was also recorded. Publications that drew data from the same study were extracted (and have been reported) separately, in order to capture the different analyses presented.
Synthesis of Results
Following data extraction, studies were characterized by sample type (juvenile justice, child welfare, crossover, other, community and mixed samples). The key results of the scoping review were then narratively synthesized.
Discussion
This scoping review aimed to provide an overview of research concerning gender differences in the maltreatment-youth offending relationship. Across four databases, 180 publications meeting inclusion criteria were evenly divided between those drawing on juvenile justice and child welfare samples, and those which employed cross-sectional and longitudinal designs. The included studies were disproportionately from the US, and the majority were conducted since 2010, likely reflecting increased attention to gender differences in the context of rising juvenile justice involvement of girls (
Pusch & Holtfreter, 2018;
Shepherd et al., 2013a). Somewhat surprising were the small number of UK-based studies, and that no qualitative studies were identified for inclusion. These characteristics may reflect the smaller number of justice-involved females in some regions, and associated challenges undertaking quantitative gendered analyses in these areas, as outlined by
Rodway et al. (2011).
The review findings highlight several gender differences and other pertinent findings concerning the characteristics, maltreatment experiences, child protection pathways and juvenile offending of maltreated boys and girls. First, a greater prevalence of child welfare involvement and maltreatment exposure was evident among justice-involved girls relative to boys, most notably in relation to sexual abuse and multi-type maltreatment (e.g.,
Baglivio & Epps, 2016;
Malvaso et al., 2019). Yet, the few studies that included relevant validity measures consistently identified a greater likelihood of under-reporting of maltreatment by justice-involved males (
Kenny et al., 2007;
Moore et al., 2013;
Protic et al., 2020). Such findings reflect clinical and research evidence regarding the lower rates of maltreatment disclosure by males, particularly in relation to sexual abuse (
Lev-Wiesel et al., 2019;
O’Leary & Barber, 2008). Given these findings, it remains unclear how under-reporting of maltreatment (particularly by males) may have influenced the conclusions drawn by the body of research examining the maltreatment-youth offending relationship. Beyond the impact on research evidence, the current findings point to the policy and practice importance of including measures of under-reporting in child maltreatment screening and assessment instruments, for instance, those utilized by juvenile justice and child welfare practitioners. Key implications of the review for future research are summarized in
Table 3, including the usefulness of future research that explores justice-involved youths’ willingness and/or reluctance to disclose childhood maltreatment. Any such research should pay attention to differences across dimensions known to be related to under-reporting and non-disclosure, such as gender, race/ethnicity, age, maltreatment dimensions and other individual characteristics (e.g. mental health and cognitive impairment status) (
Lev-Wiesel et al., 2019). Additionally, future research should consider triangulation of multiple maltreatment data sources (e.g. self-report and official data) given limitations associated with each, alongside research suggesting that studies based on prospective/official data versus retrospective self-report measures may in fact be identifying different underlying populations (
Baldwin et al., 2019). Aside from addressing under-reporting of maltreatment, the review also draws attention to the importance of considering intersectionality, particularly in terms of race and ethnicity differences in the maltreatment-offending association. The review found that gender x race differences are recognizable in several areas, including maltreatment prevalence and differential mechanisms linking maltreatment, child welfare involvement and youth offending (see, e.g.
Goodkind et al., 2013;
Zettler et al., 2018).
Reflecting general trends in the broader youth population, the findings consistently identified that males who are maltreated were more likely to offend as youth and to exhibit violent offending and recidivism, compared with females who are maltreated (e.g.,
Cho et al., 2019). At the same time, there were mixed findings regarding the extent to which gender moderated the maltreatment-offending relationship, that is, whether or not child abuse and neglect exert different impacts on the likelihood of juvenile offending (including violent offending and recidivism) among girls and boys. This forms another important area for future examination via meta-analyses and/or well-designed studies that can overcome the aforementioned issue of maltreatment under-reporting. Such studies should address the question of differential impact of maltreatment by gender, undertaking analyses based on maltreatment type and severity, as well as in relation to diverse juvenile offending outcomes (e.g. any offending and offending severity/chronicity, including recidivism).
In contrast to studies which examine the impact of maltreatment, one fairly consistent finding was that child welfare intervention, particularly OOHC placement in foster or residential care, more greatly increased the likelihood of youth convictions among females relative to males (
Jonson-Reid & Barth, 2000;
Malvaso et al., 2017a). Likewise, the apparently greater importance of school performance in moderating the maltreatment to delinquency pathway among boys also deserves further research attention (e.g.
Zingraff et al., 1994). While also requiring more detailed examination in future, such findings should be of the utmost interest to child welfare policy-makers and practitioners. Each points to the potential usefulness of gender-based strategies, underpinned by research evidence, which may reduce offending and juvenile justice system involvement among maltreated girls and boys. While the required evidence to systematically inform gender-responsive interventions remains absent in the youth space, gender-based approaches for reducing offending and justice system involvement do exist for adult populations. One example is the
Beyond Violence manualized curriculum for justice-involved women with histories of violence, which gives attention to both violent victimization and perpetration in aiming to prevent future violent experiences among this cohort, with promising results (
Covington, 2013;
Kubiak et al., 2016).
Finally, the review described the support needs of justice-involved children who are maltreated or child welfare-involved, including the greater prevalence of neurodisability among males (
Baidawi & Piquero, 2021), and generally greater mental health needs, particularly in relation to suicidality and self-harm, among females (
Logan-Greene et al., 2017;
Perez, 2017). Understanding these differences can support targeted service planning across both child welfare and juvenile justice systems.
Despite its usefulness, the review has three key limitations, which should be borne in mind when interpreting its conclusions. First, several of the included publications have drawn on the same or similar datasets. As these publications often addressed slightly different research questions, or utilized amended forms of the dataset (e.g. additional waves of longitudinal data and examination of different data subsets), studies were not pooled for the presentation of data in the supplementary tables, nor in the quantification of specific findings presented in the results. A second and related limitation is the absence of a quality appraisal, which while not performed due to resource limitations, may be more easily undertaken for smaller-scale systematic reviews deriving from these analyses. Finally, the restriction of gender to a binary in the majority of available research means that a key research gap exists concerning the experiences and trajectories of gender diverse children and young people who experience maltreatment and justice system involvement.