- Research article
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Interventions to support people exposed to adverse childhood experiences: systematic review of systematic reviews
BMC Public Health volume 20, Article number: 657 (2020)
Abstract
Background
Adverse Childhood Experiences (ACEs) such as abuse, neglect or household adversity may have a range of serious negative impacts. There is a need to understand what interventions are effective to improve outcomes for people who have experienced ACEs.
Methods
Systematic review of systematic reviews. We searched 18 database sources from 2007 to 2018 for systematic reviews of effectiveness data on people who experienced ACEs aged 3–18, on any intervention and any outcome except incidence of ACEs. We included reviews with a summary quality score (AMSTAR) of 5.5 or above.
Results
Twenty-five reviews were included. Most reviews focus on psychological interventions and mental health outcomes. The strongest evidence is for cognitive-behavioural therapy for people exposed to abuse. For other interventions – including psychological therapies, parent training, and broader support interventions – the findings overall are inconclusive, although there are some positive results.
Conclusions
There are significant gaps in the evidence on interventions for ACEs. Most approaches focus on mitigating individual psychological harms, and do not address the social pathways which may mediate the negative impacts of ACEs. Many negative impacts of ACEs (e.g. on health behaviours, social relationships and life circumstances) have also not been widely addressed by intervention studies.
Background
Adverse Childhood Experiences (ACEs) have been defined as stressful experiences occurring during childhood that directly impact on a child or affect the family environment in which they live. They include physical, sexual or emotional abuse, neglect, or household adversity as a result of domestic violence, imprisonment, substance abuse, parental mental health problems or family breakdown [1]. This definition was used by an influential CDC study in the 1990s; more recent work has extended the definition to include child neglect, parental bereavement, and children living in care [2]. The potential impacts of ACEs are physiological and behavioural, as well as psychological, and translate into poorer outcomes across a wide range of health domains [3, 4].
It is unclear what works to prevent or mitigate these negative consequences, or promote positive outcomes for those who have experienced ACEs. Previous reviews have looked at specific ACE populations but have not covered the whole spectrum of ACEs. The aim of this overview of systematic reviews was to provide a broad map of the evidence on the effectiveness of interventions for children and young people who have experienced ACEs, and identify gaps in the literature. It included systematic reviews including any effectiveness studies on any ACE-exposed population, and included all interventions and outcomes.
Methods
Due to the extent of the available literature, we employed a review-of-reviews method to provide a broad overview of the topic [5, 6]. We focused on recent, high-quality reviews to prioritise the most methodologically robust evidence. The review question was: What is known from systematic reviews about the effectiveness of interventions for children and young people (3–18 years) who have been exposed to adverse childhood experiences (ACEs)?
The review protocol was registered in PROSPERO (registration CRD42018092192). EPPI-Reviewer 4 software was used to manage data. After initial ad hoc scoping searches, we searched 23 databases and other online resources that contain research literature in healthcare, mental health, social care, social science, education, child and adolescent development, and systematic reviews, as follows:
ASSIA (Proquest)
British Education Index (EBSCO)
British Nursing Index (EBSCO)
Child development and adolescent studies (EBSCO)
CINAHL Plus (EBSCO)
Cochrane Database of Systematic Reviews (Cochrane Library)
Database of Reviews of Effectiveness (DARE) (Cochrane Library)
EMBASE (OVID)
ERIC (EBSCO)
Health Management Information Consortium (HMIC) (OVID)
IBSS (Proquest)
Medline (OVID)
PILOTS (Published International Literature On Traumatic Stress)
PsycINFO (OVID)
PUBMED/Medline
Social Policy and Practice (OVID) (this includes the NSPCC Child Protection Database)
Sociological Abstracts (Proquest)
Social Sciences Citation Index (Web of Science)
Bielefeld Academic Search Engine
Campbell Collaboration Library
Epistamonikas
NHS Evidence
Research in Practice
The search strategy combined terms for specific ACEs with terms for children and young people, and terms for a range of systematic review types (see Additional file 1). The search was designed and implemented by an information specialist in consultation with other members of the review team. The search was limited to reviews published since 2007; however, reviews included older primary studies. In addition, we searched for references from the NICE guideline on transition from children’s to adults’ services for young people using health or social care services (NG43) and on child abuse and neglect (NG76). Searches were carried out in March 2018.
We included systematic reviews of effectiveness data on people who experienced ACEs aged between 3 and 18 inclusive (adults who had experienced ACEs as children were also included); see Additional file 1 for details. We excluded younger children (0–2 years) as interventions focusing on this age group tend to focus on primary prevention or on psychological factors such as attachment, rather than on the impacts of ACEs. We included any outcomes measured on the person who experienced ACEs except the incidence of ACEs themselves (i.e. we did not look at the primary prevention of ACEs, or at outcomes for parents). We used the broad definition of ACEs employed by Allen and Donkin [2], with the further addition of homelessness as an important family-level stressor. We limited inclusion to reviews in English due to limited resource for translation (reviews including non-English-language primary studies were included). In more detail, the inclusion criteria were as follows:
- 1)
Is the reference a systematic review of primary studies?
Include any review of primary studies which reports some information on the search strategy and clearly defined inclusion criteria.
- 2)
Does the review report effectiveness data?
Exclude reviews of observational quantitative data or qualitative data only.
- 3)
Does the review include (an) ACE population(s)?
Include the following populations: sexual abuse; physical abuse; verbal or emotional abuse; neglect. Include household adversity, where a parent or guardian: is a victim of intimate partner violence; is in prison or on probation; has a mental health problem; abuses alcohol or drugs; is separated or divorced; or has died. Include children and young people living in care (in a care setting or elsewhere; include kinship care; exclude adopted children). Include homeless children or young people. Exclude reviews whose population partly overlap with our ACE criteria, and/or which is defined with broader terms such as ‘high risk’ or ‘trauma’, unless ≥ 70% of included studies include populations in the ACE criteria above, or there is a clearly presented subgroup analysis of a subset of the studies which meet these criteria.
- 4)
Does the review concern interventions aimed at people who have experienced ACEs?
- 5)
Does the review report outcomes for children or young people (aged 3–18 inclusive) who have experienced ACEs?
Include any outcome relating to the child or young person, except outcomes relating to the (re)occurrence or incidence of ACEs themselves (abuse, parental substance use, homelessness etc.). Exclude reviews only reporting on parent/carer outcomes and not child outcomes. Include outcomes measured on people aged > 18 years if they experienced ACEs at age 3–18. Include any follow-up period.
- 6)
Does the review report data from OECD (Organisation for Economic Co-operation and Development) member countries?
- 7)
Is the review report available in English?
Include reviews which include non-English-language primary studies, if the review itself is reported in English.
- 8)
Was the review published in 2007 or later?
- 9)
Is a full report of the review available?
Exclude reviews for which only a protocol or an abstract is available.
An initial sample of 10% of abstracts were screened independently by two reviewers and differences resolved by discussion; the remaining abstracts were screened by a single reviewer. All full-text references were screened by two reviewers independently and differences resolved by discussion.
The AMSTAR tool was used to assess review quality [7]. Quality assessment was conducted by one reviewer and checked in detail by a second. We translated the AMSTAR results into an overall score out of 11 (see Additional file 1) and applied a threshold of 5.5 or higher for inclusion in the synthesis.
A narrative synthesis was undertaken. We grouped the data according to intervention type and outcome (see below). We extracted findings where reporting allowed, and where there was evidence from at least 2 controlled studies for a given intervention and outcome domain. Where reviews conducted meta-analyses we extracted pooled effect sizes, and otherwise summarised the results in general terms as effective, ineffective or mixed. We extracted data on all outcomes for those experiencing ACEs (not for parents), except those relating to (re)occurrence or incidence of ACEs themselves. Where multiple outcomes were reported, we aggregated them into the following domains:
Mental health (e.g. anxiety, depression)
Behaviour (e.g. externalising behaviour, problem behaviour)
Social and relationship outcomes (e.g. social support).
Results
The flow of literature is shown in Fig. 1. Prior to quality assessment, 96 reviews were included. We included in the synthesis all reviews with an AMSTAR score of 5.5 or higher (N = 27). The full results of quality assessment are presented in Additional file 1. (Some reviews did not contribute to the synthesis, either because they were superseded by a later review [8] or contained no studies [9], or due to our restrictions on data extraction (see above) [10,11,12,13,14].)
The results are summarised in Table 1. We divided the findings into seven categories of intervention.
1. Cognitive Behavioural Therapy. Seven reviews investigated CBT for a range of ACE populations [15,16,17,18,19,20,21]. The most substantive results come from Macdonald et al.’s review, which found that CBT improved mental health outcomes for people who had experienced abuse or neglect [19].
2. Other psychological therapies. A range of other psychological therapies, such as brief motivational interviewing, family therapy and psychodynamic psychotherapy, were evaluated in six reviews [15, 18, 19, 21,22,23]. The findings do not provide strong evidence of effectiveness, although the interventions are heterogeneous.
3. Psychoeducation. Three reviews included psychoeducation [18, 19, 24]; the findings are mixed, although one meta-analysis finds evidence of effectiveness for mental health outcomes in children of parents with depression [24].
4. Parent / foster carer training. Eleven reviews included training for parents and foster carers, including a range of ACE populations; most studies focus on behaviour problems [17,18,19, 22, 23, 25,26,27,28,29,30]. However, the results overall are inconclusive.
5. Cross-sector support. Five reviews included cross-sector support interventions (such as case management, ‘wraparound’ support and treatment foster care), mainly for looked-after children and young people [18, 19, 23, 30, 31]. This category is heterogeneous and the results overall are mixed, but there are some positive findings.
6. Educational interventions. The evidence on educational and school-based interventions mainly comes from a single review on looked-after children and young people; the results overall are mixed [32].
7. Housing and life skills interventions. One review finds that support services for young people transitioning out of care are effective for housing and independent living outcomes but not for other outcomes [34], and one that interventions for homeless young people are largely ineffective for outcomes including alcohol or drug use or mental health [33].
Discussion
The findings of this review of reviews indicate that there is limited evidence for the effectiveness of most interventions for children and young people who have experienced ACEs. The strongest evidence is for the effectiveness of CBT for mental health outcomes in children who have been sexually abused. The evidence on other interventions and populations is generally more equivocal, although there are some positive findings.
Our findings indicate some important gaps in the review-level evidence. Most data relate to psychological interventions aiming to improve individuals’ mental resilience; this is true across the abuse and neglect populations as well as the household adversity populations. For the looked-after and homeless populations the range of interventions is somewhat broader, and includes more service-level programmes aiming to improve the support provided by agencies such as welfare services or schools. While the evidence on these interventions is inconclusive, it may be of value to explore their generalisability to other ACE populations. There is very limited evidence concerning any social or community-level interventions, for example to address socio-economic disadvantage or social isolation; this is not unexpected, as most such interventions include a broad range of populations and are unlikely to be evaluated on ACE populations specifically, but it is a limitation.
Similarly, the great majority of the outcomes measured in the studies relate to mental health or, for younger children, behaviour problems. With the exception of looked-after and homeless children and young people, there is very little data on broader outcomes in the domains of social relationships, life circumstances (e.g. housing, education) or behaviours (e.g. drug use, criminal involvement). As these outcomes have been identified in epidemiological research as important negative impacts of ACEs, the lack of effectiveness data on them is an important gap in the evidence.
The methodology used for this review has some limitations. It involves some double-counting of primary studies. In most cases the actual overlap between reviews is fairly limited and, given the high-level nature of the synthesis, unlikely to have a major impact on the interpretation of findings. The main exception is the literature on foster parent training, where three different reviews show substantial overlap [17, 23, 26]. The findings on this intervention should therefore be treated with caution. Our findings represent only a very high-level overview of the data: some of the intervention categories are very broad, and the ‘mixed’ results call for more detailed exploration. The findings are also partly dependent on review authors’ categorisation of interventions.
We defined ACEs in terms of a fixed list of population characteristics, partly for pragmatic reasons and partly because this approach has been widely used, and so facilitates comparison of our findings with the broader literature. However, it has some conceptual limitations. Many potentially relevant life stressors are not captured in ACE on our definition, including for example: factors affecting children and young people directly such as mental or physical health conditions, or alcohol or drug abuse; socioeconomic disadvantage and poverty, both at family level and community level; or broader environmental stressors such as community violence or natural disaster. The broader concept of ‘trauma’ covers some of these stressors [20, 35, 36], and could usefully be used to illuminate the broader dynamics of stress and resilience at work in ACE populations, although it arguably has limitations of its own. Conversely, treating ACEs as an itemised list of discrete experiences may not capture the role of multiple cumulative stress. Experiencing multiple ACEs is much more strongly correlated with negative outcomes than experiencing one or two [3, 37]. However, as our findings show, the effectiveness literature has tended to treat ACE populations separately, with limited consideration of the impacts of multiple interacting forms of disadvantage.
These limitations aside, this review suggests that the evidence base on interventions for people who have experienced ACEs may not be ideally suited to informing policy and practice. While individual interventions to mitigate psychological trauma are a potentially important avenue for addressing ACEs, many would argue that they need to form part of broader strategies which also aim to address the social factors which may mediate the negative impacts of ACEs, including material disadvantage and social isolation [2]. Such strategies could draw on interventions for the primary prevention of ACEs which were not included in this review [38, 39], but evidence on what works for people who have experienced ACEs is also needed. This could take the form of focused evaluation studies on, for example, school-based programmes or life skills training aiming to empower ACE populations, and/or subgroup analyses to understand how community-level interventions might address the consequences of ACEs. More indirect approaches could also be of value, such as modelling work using the epidemiological evidence base on the prevalence and distribution of ACEs to understand the likely impact of interventions with a broader population focus. Of course, such work should be based on consultation and involvement of children and young people who have experienced ACEs, to ensure it addresses their needs. It could also draw on the extensive body of qualitative evidence on these questions which points to the need for (evaluations of) longer term interventions which afford the necessary time to build up trust and address the ongoing and multi-faceted needs of children and young people affected by ACEs [40].
Conclusions
The evidence for most interventions for people who have experienced Adverse Childhood Experiences is equivocal; the most promising results are for CBT for mental health outcomes. The majority of the existing evidence focuses on psychological interventions and on mental health outcomes, and there is a lack of studies on service- or community-level interventions, and on social or behavioural outcomes. Evidence from observational and qualitative research indicates that people exposed to ACEs, especially multiple ACEs, often have complex needs, but there is limited information in the evaluation literature about how best to address these needs.
Availability of data and materials
The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- ACEs:
-
Adverse Childhood Experiences
- AMSTAR:
-
A MeaSurement Tool to Assess systematic Reviews
- CBT:
-
Cognitive behavioural therapy
- CDC:
-
Centers for Disease Control and Prevention
- NICE:
-
National Institute for Health and Care Excellence
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The report is based on independent research commissioned and funded by the National Institute of Health Research (NIHR) Policy Research Programme. The views expressed in the publication are those of the author(s) and not necessarily those of the NHS, the NIHR, the Department of Health, arms’ length bodies or other government departments. The funders had no role in designing the study, collecting, analysing or interpreting data, or in writing the manuscript.
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CS wrote and conducted searches. SL and TL conducted screening, quality assessment and data extraction; SL, TL and KS conducted synthesis. TL wrote the first draft of the paper with the involvement of SL, KS and JT. All authors read and approved the final manuscript.
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Supplementary information
Additional file 1.
Appendix A. Example search strategy. Appendix B. Quality assessment tool. Appendix C. Results of quality assessment. Appendix D. Quality assessment tools used in included reviews.
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Lorenc, T., Lester, S., Sutcliffe, K. et al. Interventions to support people exposed to adverse childhood experiences: systematic review of systematic reviews. BMC Public Health 20, 657 (2020). https://doi.org/10.1186/s12889-020-08789-0
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DOI: https://doi.org/10.1186/s12889-020-08789-0