A Systematic Review of the Impact of Placement Instability on Emotional and Behavioural Outcomes Among Children in Foster Care.

Foster care children are a highly vulnerable population and their experiences in care are considered crucial to their developmental and psychosocial wellbeing. Placement instability has been considered a possible risk factor for developmental difficulties due to its impact on the development of a reparative attachment relationship and sense of relational permanence. The current review synthesises the literature regarding the impact of placement instability on behavioural and mental health outcomes in foster care children. Three major databases and grey literature sources were searched for all relevant quantitative research published by July 2019. Titles and abstracts of 2419 articles were screened following searches, with full texts obtained for 51 studies and 14 included in the final review. All were subject to quality assessment by two independent reviewers. Results indicated that placement instability was a consistent predictor of externalising behaviour in children, although some evidence was counter-indicative in this regard. There was also evidence to suggest a relationship with internalising behaviours, and mental health difficulties, in particular PTSD symptoms. Methodological quality and design varied between studies which limited direct comparisons. Most notably, there was a lack of consensus on how to quantify and measure placement instability and many studies failed to control for potentially confounding care-related variables. The review highlights that instability seems to result in negative psychological outcomes, although the extent of this relationship remains unclear. The review's findings are discussed with reference to research and clinical implications.

Parental Attachment and Psychosocial Adjustment in Adolescents Exposed to Marital Conflict.

(1) Background: Interparental conflict is a phenomenon that poses a serious threat not only to the quality of life of the couple but also to the father-child relationship, mother-child relationship, and well-being of adolescents. This study examined the difference in parental attachment and adjustment in adolescents exposed to marital conflict versus those not exposed to parental conflicts in low-income areas. (2) Methods: 67 adolescents involved in Child Welfare Services (CWS) in disadvantaged neighbourhoods in southern Spain were examined. The sample was split into two groups according to the exposure to marital conflict. Subsequently, differences between groups were analysed on father attachment, mother attachment, aggression, antisocial behaviour, and emotional intelligence. (3) Results: Primarily, the data showed significantly worse attachment with the father among conflict-exposed versus non-conflict-exposed adolescents. These results were not found for the attachment with the mother. Additionally, greater anger and worse stress management were found in conflict-exposed adolescents. (4) Conclusions: The results partially confirmed the spillover and compensatory hypothesis. Practical implications point out that developing preventive interventions that protect the father-adolescent attachment in situations of family conflict is recommended.

Commentary: Early intervention for conduct problems as a child protection strategy - reflections on Nobakht et al. (2023).

Adverse childhood experiences (ACEs), including child maltreatment and interparental aggression, are known to have far-reaching consequences for mental health across the lifespan. Emerging evidence, such as that reported by Nobakht et al. (Journal of Child Psychology and Psychiatry, 2023), indicates that child conduct problems (e.g. oppositional defiant disorder, conduct disorder) may not only result from adversity but also contribute to it through transactional cascades that amplify risk for adversity over time. This commentary addresses some of the key implications of this evidence for translation into practice. It is argued that child conduct problems can be viewed as modifiable determinants of adversity and that the early identification and treatment of child conduct problems may allow for the early identification and reduction of risk for numerous ACEs.

Mindful parenting and child behaviour problems: A chain mediating role of parental and child communicating performance.

OBJECTIVE: This study investigates the impact of mindful parenting on child behaviour problems and examines the chain mediating role of parental and child communicating performance in this relationship. METHODS: A 10-month follow-up survey was conducted, utilizing the Interpersonal Mindfulness in Parenting Scale (IM-P), the Parent-Child Communication Inventory, and the abbreviated version of the Child Behaviour Checklist (CBCL). RESULTS: At baseline (T1), higher levels of mindful parenting in parents were significantly and positively associated with both T1 parental communicating performance and child communicating performance. After 10 months, all three variables showed significant negative associations with child behaviour problems. T1 parental communication performance positively correlated with T1 child communication performance. After controlling for T1 child behaviour problems, children's gender and age, and parents' gender, the indirect association between T1 parents' levels of mindful parenting and T2 child behaviour problems was significant, mediated by T1 parental communicating performance and T1 child communicating performance. CONCLUSION: Mindful parenting enhances parental communication behaviour, leading to improved child communication behaviour and reduced child behaviour problems.

I Know What to Do; I Can Do It; It Will Work: The Brief Parental Self Efficacy Scale (BPSES) for Parenting Interventions.

Parental self-efficacy predicts outcomes for parenting interventions for child behaviour problems, but there is a need for a brief measure that can be repeated over treatment and applies to a wide age range. The present study describes the development of such a measure, the Brief Parental Self-Efficacy Scale (BPSES). The psychometrics of the BPSES is presented across a wide age range from preschool to late adolescent in a sample comprised of four different intervention contexts. Evidence for structural validity, internal consistency, content validity, configural measurement invariance (equivalent factor structure) and test-retest reliability is presented alongside convergent validity against measures of parental self-efficacy, child behaviour problems, as well as self-report and observed parenting styles. Finally, lower levels of BPSES at baseline predicted increased disengagement from an intensive, individualised family therapy intervention for antisocial youth, while higher baseline levels predicted increased response to a group parenting programme for primary school aged children. The BPSES shows promise as a measure that can be used across a wide age-range, for a variety of parenting interventions for disruptive behaviour problems and which is sufficiently brief to be used as a routine outcome measurement during treatment.

Treating sleep problems in young children: A randomised controlled trial of a group-based, parent-focused behavioural sleep intervention.

This study tested the efficacy of a 5 × 1.5 h/session, group-based, parent-focused, behavioural intervention (BI) targeting sleep problems in preschool children. Parents were randomised to either the BI (N = 62) or care as usual (CAU; N = 66) conditions. Outcomes included sleep, anxiety, behavioural problems, internalising and externalising symptoms, transition to school and academic achievement. Assessments were conducted at pre- and post-BI intervention (in the year prior to formal schooling), and then at follow-ups 1 and 2 in the first year of formal schooling. Relative to the CAU, the BI condition demonstrated significantly greater improvements in sleep, anxiety, behaviour problems and internalising and externalising symptoms from pre-to post-intervention. Improvements in sleep, anxiety, and internalising symptoms were maintained, while behaviour and externalising symptoms were further improved upon at school follow-up 2. For the BI group, improvements in sleep at post-intervention were found to mediate improvements in anxiety, internalising, and externalising symptoms, but not behaviour problems, at school follow-ups 1 and 2. There were no significant effects of condition on school transition or academic outcome measures. The results suggest that the BI is effective for sleep, anxiety, behaviour, internalising and externalising symptoms, but not for school transition or academic outcomes. ANZCTR NUMBER: ACTRN12618001161213.

Behaviour outcomes three months after mild TBI in preschool children.

This study examined parents' report of behaviour in preschoolers after a mild traumatic brain injury (mTBI), compared the proportion of preschoolers with elevated behaviour ratings between the mTBI and limb injury (LI) groups, and explored injury, premorbid child, and parent variables that may be associated with parents' report of behaviour at three months post-injury. Children aged 2-5 years with a mTBI (n = 13) or mild LI (n = 6) were recruited from the emergency department. Behaviour was assessed using the Child Behaviour Checklist. Preliminary findings showed that post-injury behaviour ratings remained in the normal range. The mTBI group had higher scores than the LI group at three months post-injury in terms of sleep; however, this may have been pre-existing. Two children with mTBI received borderline-clinically significant ratings on diagnostic-level anxiety problems at the three-month follow-up, while none of the limb-injured controls obtained elevated behaviour ratings. Parent-rated post-injury behaviour was significantly associated with premorbid child functioning and parental stress, which needs to be explored in greater detail using larger preschool mTBI samples.

Secular trends and social inequalities in child behavioural problems across three Brazilian cohort studies (1993, 2004 and 2015).

AIMS: Previous epidemiological evidence identified a concerning increase in behavioural problems among young children from 1997 to 2008 in Brazil. However, it is unclear whether behavioural problems have continued to increase, if secular changes vary between sociodemographic groups and what might explain changes over time. We aimed to monitor changes in child behavioural problems over a 22-year period from 1997 to 2019, examine changing social inequalities and explore potential explanations for recent changes in behavioural problems between 2008 and 2019. METHODS: The Child Behaviour Checklist was used to compare parent-reported behavioural problems in 4-year-old children across three Brazilian birth cohorts assessed in 1997 (1993 cohort, n = 633), 2008 (2004 cohort, n = 3750) and 2019 (2015 cohort, n = 577). Response rates across all three population-based cohorts were over 90%. Moderation analyses tested if cross-cohort changes differed by social inequalities (demographic and socioeconomic position), while explanatory models explored whether changes in hypothesized risk and protective factors in prenatal development (e.g., smoking during pregnancy) and family life (e.g., maternal depression and harsh parenting) accounted for changes in child behavioural problems from 2008 to 2019. RESULTS: Initial increases in child behavioural problems from 1997 to 2008 were followed by declines in conduct problems (mean change = -2.75; 95% confidence interval [CI]: -3.56, -1.94; P < 0.001), aggression (mean change = -1.84; 95% CI: -2.51, -1.17; P < 0.001) and rule-breaking behaviour (mean change = -0.91; 95% CI: -1.13, -0.69 P < 0.001) from 2008 to 2019. Sex differences in rule-breaking behaviour diminished during this 22-year period, whereas socioeconomic inequalities in behavioural problems emerged in 2008 and then remained relatively stable. Consequently, children from poorer and less educated families had higher behavioural problems, compared to more socially advantaged children, in the two more recent cohorts. Changes in measured risk and protective factors partly explained the reduction in behavioural problems from 2008 to 2019. CONCLUSIONS: Following a rise in child behavioural problems, there was a subsequent reduction in behavioural problems from 2008 to 2019. However, social inequalities increased and remained high. Continued monitoring of behavioural problems by subgroups is critical for closing the gap between socially advantaged and disadvantaged children and achieving health equity for the next generation.

Do Children Think it is Important to Predict Learning and Behaviour Problems, and Do They Think Genetic Screening Has a Role to Play in This?

This study explores how capable young children are of thinking about a potential future that uses DNA screening to assess an individual's likelihood of experiencing learning or behaviour difficulties. Puppets and a scenario-based approach were used to ask children aged 4-10 (n = 165) whether they thought DNA screening might be helpful or harmful. A content analysis derived six categories: (1) 'Worried about being - and being seen as - different'; (2) 'Beliefs about the origins of learning and behaviour'; (3) 'Testing is harmful'; (4) 'Testing could help'; (5) 'How soon is too soon for testing?'; and (6) 'What's the point?'. Findings indicate young children, as key stakeholders, can make useful contributions to public debate in this important and controversial area.

The power of family? Family social capital and the risk of externalising behaviours among youth with multiple childhood adversities.

Externalising behaviour problems (EBP), or aggressive and delinquent behaviours, among youth pose a significant problem for their peers, parents, teachers and society. Many types of childhood adversities increase the risk of EBP, including maltreatment, physical punishment, domestic violence, family poverty and living in violent neighbourhoods. This study asks, to what extent do children who face multiple adversities during childhood suffer an increased risk of EBP and is family social capital (FSC) associated with a lower risk? Using seven waves of panel data from the Longitudinal Studies of Child Abuse and Neglect, I examine the accumulation of adversities associated with greater risk of EBP among youth and investigate whether FSC-family network, support and cohesion-in early childhood is associated with a reduction in EBP risk. Experiencing early and multiple adversities resulted in the worst EBP trajectories throughout childhood. Although, among youth with the highest adversities, if early family support was also high, their EBP trajectories are more favourable than their disadvantaged peers with less support. FSC may protect against EBP when multiple childhood adversities are experienced. The need for early EBP interventions and bolstering FSC are discussed.

Technology Matters: Digital micro interventions to support parenting: Evaluating time out apps.

Digital interventions to support parenting skills are popular but engagement can be low. Digital micro interventions such as apps targeting specific aspects of parenting are a novel development with the potential to overcome this challenge. Time out is an evidence-based component of many parenting skills training programmes and is an appropriate target for digital micro intervention. We describe the eight requirements of high-quality time out according to the literature and how these can be supported by an app. Searches of the App Store, Google Play, and Alexa Skills in the UK identified six apps designed to support time out. Current time out apps all promoted consistency, but they all risked low-quality time out through inappropriate initiation, duration, and termination. Professionals in child and adolescent mental health should explore the details of any digital micro interventions being used by parents for time out and provide appropriate counselling. We recommend that all future digital micro interventions in this area should incorporate evidence-based guidance.

Reciprocal associations between affective decision-making and mental health in adolescence.

Poor affective decision-making has been shown to associate cross-sectionally with poor mental health in clinical populations. However, evidence from general population samples is scarce. Moreover, whether decision-making is prospectively linked to mental health in youth in the general population and whether such associations are reciprocal have yet to be examined. The present study examined bidirectional associations between various aspects of affective decision-making and emotional and behavioural problems at ages 11 and 14 years in 13,366 members of the Millennium Cohort Study. Decision-making (delay aversion, deliberation time, quality of decision-making, risk adjustment, risk-taking) and emotional (emotional symptoms, peer problems) and behavioural (conduct problems, hyperactivity/inattention) problems were measured using the Cambridge Gambling Task and the Strengths and Difficulties Questionnaire, respectively. Results of cross-lagged panel models adjusted for confounding revealed a negative reciprocal association between hyperactivity and quality of decision-making but also positive reciprocal associations between conduct problems and delay aversion, and between peer problems and deliberation time. Emotional problems and peer problems predicted a decrease in risk-taking, conduct problems predicted an increase in risk-taking, and hyperactivity predicted an increase in delay aversion and deliberation time. Furthermore, hyperactivity and conduct problems predicted less risk adjustment, and risk adjustment predicted fewer peer problems. The results suggest that behavioural problems are prospectively linked to greater risk-taking and lower risk adjustment in adolescence. Moreover, adolescents with behavioural problems tend to make poorer decisions and be more delay-averse, but also poorer quality of decision-making and increased delay aversion are associated with more behavioural problems over time.

Transdiagnostic profiles of behaviour and communication relate to academic and socioemotional functioning and neural white matter organisation.

BACKGROUND: Behavioural and language difficulties co-occur in multiple neurodevelopmental conditions. Our understanding of these problems has arguably been slowed by an overreliance on study designs that compare diagnostic groups and fail to capture the overlap across different neurodevelopmental disorders and the heterogeneity within them. METHODS: We recruited a large transdiagnostic cohort of children with complex needs (N = 805) to identify distinct subgroups of children with common profiles of behavioural and language strengths and difficulties. We then investigated whether and how these data-driven groupings could be distinguished from a comparison sample (N = 158) on measures of academic and socioemotional functioning and patterns of global and local white matter connectome organisation. Academic skills were assessed via standardised measures of reading and maths. Socioemotional functioning was captured by the parent-rated version of the Strengths and Difficulties Questionnaire. RESULTS: We identified three distinct subgroups of children, each with different levels of difficulties in structural language, pragmatic communication, and hot and cool executive functions. All three subgroups struggled with academic and socioemotional skills relative to the comparison sample, potentially representing three alternative but related developmental pathways to difficulties in these areas. The children with the weakest language skills had the most widespread difficulties with learning, whereas those with more pronounced difficulties with hot executive skills experienced the most severe difficulties in the socioemotional domain. Each data-driven subgroup could be distinguished from the comparison sample based on both shared and subgroup-unique patterns of neural white matter organisation. Children with the most pronounced deficits in language, cool executive, or hot executive function were differentiated from the comparison sample by altered connectivity in predominantly thalamocortical, temporal-parietal-occipital, and frontostriatal circuits, respectively. CONCLUSIONS: These findings advance our understanding of commonly co-morbid behavioural and language problems and their relationship to behavioural outcomes and neurobiological substrates.

Challenging the Sensitive Window Hypothesis: Timing Effects of Maternal Depressive Symptoms on the Intergenerational Transmission of Maltreatment and Psychopathology in the Next Generation.

OBJECTIVE: The current study explored the role of maternal depressive symptoms in the intergenerational transmission of childhood maltreatment and developmental psychopathology. Based on the sensitive window hypothesis, the effects of earlier versus later maternal depression symptoms on child development were analysed. METHOD: Ninety-nine mother-child dyads, 65% of which had high-risk teenage mothers, participated in a longitudinal study with three assessments in the first 18 months of the child's life (T1-T3) and a 4th reassessment (T4) at the child's preschool age. Using serial mediation analyses, we tested whether the relationship between the mother's own maltreatment history (Childhood Experience of Care and Abuse Questionnaire) and the child's psychopathological outcome at preschool age was mediated in a causal effect chain by maternal depression in the first 2 years of life, by current maternal depression (Beck Depression Inventory-II) and by current maternal child abuse potential (Child Abuse Potential Inventory). The children's emotional problems and externalizing symptoms were assessed at preschool age by parent or teacher Strengths and Difficulties Questionnaire ratings. RESULTS: The results indicated that especially later maternal depression mediated the relationship between maternal childhood maltreatment and negative developmental outcomes in the next generation. The effects of maltreatment type on maternal depression were rather nonspecific. However, mental abuse affected existing risk factors more directly over time compared to physical and sexual abuse. Additionally, the impact of early life maltreatment and maternal depression on child psychopathology varied by rater. The pathway to externalizing symptoms was significant only in teacher ratings and for the pathway to emotional problems only in maternal ratings. CONCLUSIONS: The present findings suggest that early maternal depression followed by ongoing maternal depression plays a mediating role in the intergenerational cycle of maltreatment. Therefore, in the future, interventions should be offered at an early stage, but also extend well beyond the first 2 years of a child's life, addressing maternal depression and trauma.

Responding to child and adolescent-to-parent violence and abuse from a distance: Remote delivery of interventions during Covid-19.

Working with families living with child and adolescent-to-parent violence raises a number of challenges which were compounded during the Covid-19 pandemic. In this article, UK umbrella organisation 'Respect' is used as a case study to explore how 10 practitioners navigated social, emotional and safeguarding concerns that occurred when transitioning to remote working. Engagement with children and young people proved difficult, especially for those with special education needs and/or disabilities. However, parental engagement with services increased. Practitioners were quick to adapt to the changing landscape of remote working; continually adapting their practice to otherwise unforeseen safeguarding and/or practical challenges.

The Occurrence of the Sensory Processing Disorder in Children Depending on the Type and Time of Delivery: A Pilot Study.

Over recent years, the concept of Sensory Integration has become more popular. Knowledge about Sensory Processing Disorder (SPD) also has grown, and it is often discussed in scientific research. Sensory disturbances can cause problems in learning and behaviour of children in whom no medical diagnosis has been made. These are healthy children regarding the environment, but their behaviour is often described as strange in the meaning not appropriate/not adequate to the situation. The aim of the study was to analyse if there is a correlation between occurrence of SPD and the time or the way of delivery. Participants were 75 children, ages 5-9 years old. Children born prematurely (n = 25), and children delivered by caesarean section (C-section) (n = 25) were compared to the ones born on time by natural means (n = 25). Research was based on a questionnaire filled by children's parents. Descriptive results and percentage calculations were compared. SPD were detected among 84% of pre-borns and among 80% of children delivered by C-section and it is statistically significant. Both groups are at higher risk of Sensory Processing Disorder than those delivered on time by vaginal birth. Due to the results, the time and the way of the delivery are the factors that affect Sensory Processing Disorder.

Life-Course Influence of Adolescent Behaviour Problems on Type 2 Diabetes in Midlife: Results from 1958 British Birth Cohort Study.

Purpose: To assess whether there is a long-term relationship between childhood behaviour problems and type 2 diabetes in midlife. The study will also investigate whether any of such relationship is independent of other factors which may be associated with type 2 diabetes. Design: Cohort study. Participants: A total of 9377 members of the 1958 British birth cohort participated in the biomedical survey at age 45 years. The cohort has been followed up at regular intervals in childhood (age 7, 11 and 16 years) and adulthood (23, 33, 42 and 45 years). Predictor Variables: Information regarding childhood behaviour collected during follow-ups at ages 7, 11 and 16 years. Main Outcome Variables: Type 2 diabetes assessed using HbA1c at age 45 years. Results: Unadjusted estimates show that teachers reported adolescent behaviour problems at age of 16 are associated with increased risk of type 2 diabetes in midlife. After adjustment for potential confounders and mediators in childhood and adulthood, a relationship was observed between the severity of adolescent behaviour problems and type 2 diabetes risk in midlife (mild behaviour problems: OR 2.17, 95% CI 1.11-4.23; severe behaviour problems: OR 4.40, 95% CI 1.14-16.99). However, no such relationship was observed between behaviour problems at 7 and 11 years and type 2 diabetes in midlife. Conclusion: There is an association between adolescent behaviour problems and an increased risk of type 2 diabetes in midlife. Further molecular/genetic studies are required to understand the biological basis for this observed association.

The effect of special educational assistance in early childhood education and care on psycho-social difficulties in elementary school children.

BACKGROUND: Three to seven percent of pre-schoolers have developmental problems or child psychiatric disorders. Randomized controlled trials (RCTs) indicate that interventions in early childhood education and care (ECEC) improve long-term outcomes of children from disadvantaged backgrounds. It is unknown if such effects generalize beyond the well-structured context of RCTs and to children who may not have a disadvantaged background but have developmental problems or psychiatric disorders. METHODS: We used data from the population-based Norwegian Mother, Father and Child Cohort Study, recruiting pregnant women from 1999 to 2009, with child follow-up from ages 6, 18, and 36 months to ages 5, 7, and 8 years. This sub-study included 2499 children with developmental problems or psychiatric disorders at age five. We investigated the effects of special educational assistance at age five on mother-reported internalizing, externalizing, and communication problems at age eight. We analysed bias due to treatment by indication with directed acyclic graphs, adjusted for treatment predictors to reduce bias, and estimated effects in different patient groups and outcome domains with a hierarchical Bayesian model. RESULTS: In the adjusted analysis, pre-schoolers who received special educational assistance had on average by 0.1 (0.04-0.16) standardised mean deviation fewer psycho-social difficulties in elementary school. CONCLUSION: In a sample of children from mostly higher socioeconomic backgrounds we estimate a positive effects of special educational assistance during the transition from preschool to the school years. It may therefore be considered as an intervention for pre-schoolers with developmental or behaviour problems. More research with improved measurements of treatment and outcomes is needed to solidify the findings and identify success factors for the implementation of special educational assistance in ECEC.

The Effectiveness of KEEP for Families of Children with Developmental Delays: Integrating FIND Video Coaching into Parent Management Training-Oregon Model: a Randomized Trial.

Children with developmental delays or disabilities (DD) are at risk for self-regulation difficulties and behaviour problems compared to typically developing children. Intervening early is crucial to prevent long-term adjustment challenges across home and school contexts. Parenting has been identified as a malleable target of intervention for improving children's adaptive functioning across behavioural, emotional and cognitive domains. Although parent management training (PMT) is an identified best-practice, key questions remain about the critical components of interventions and how novel approaches like video feedback may offer additional benefits. Using a pre-test-post-test one group and superiority design, we evaluated the efficacy of two models of the Keeping Parents Trained and Supported (KEEP) preschool program with parent-only components among 175 families with children diagnosed or at-risk for DD. KEEP-P included core PMT (Oregon Model) methods and KEEP-V integrated KEEP with Filming Interactions to Nurture Development video coaching methods for enhancing developmentally supportive interactions. Intervention outcomes on children's behaviour problems and executive functioning, parenting stress and parent-child relationship quality were compared between groups. Both groups demonstrated significant reductions over time in child behavioural problems, developmental problems and parenting stress. Significant improvements were observed in children's executive functioning, parents' sense of competence and mindfulness in parenting. Group differences were observed in parent's sense of competence, with individuals receiving KEEP-P displaying greater increases over time. Higher intervention dosage predicted a greater reduction in stressful child behaviours and greater improvements in children's inhibitory control.

Cognitive, emotional, and social functioning of preschoolers with attention deficit hyperactivity problems.

BACKGROUND: Attention Deficit Hyperactivity Disorder (ADHD) is associated with deficits in different functional domains. It remains unclear if deficits in different domains are equally strong in early childhood, and which deficits are specific to ADHD. Here, we describe functional domains in preschoolers and assess deficits in children with ADHD problems, by comparing them to preschoolers with other mental health problems or who develop typically. METHODS: The ADHD Study assessed 1195 ca. 3.5 years old preschoolers through a semi-structured parent interview, parent questionnaires, and with neuropsychological tests. We determined functional domains by applying factor analytic methods to a broad set of questionnaire- and test-scales. Using resulting factor scores, we employed a Bayesian hierarchical regression to estimate functional deficits in children with ADHD. RESULTS: We found that preschoolers' functioning could be described along the seven relatively independent dimensions activity level and regulation, executive function, cognition, language, emotion regulation, introversion, and sociability. Compared to typically developing preschoolers, those with ADHD had deficits in all domains except introversion and sociability. Only deficits in activity level regulation and executive functions were larger than 0.5 standardised mean deviations and larger than deficits of children with other mental health problems. CONCLUSIONS: Preschoolers with ADHD have deficits in multiple functional domains, but only impairments in activity level and regulation and executive functions are specific for ADHD and large enough to be clinically significant. Research on functioning in these domains will be important for understanding the development of ADHD, and for improving treatment and prevention approaches.