Parenting programs are the recommended strategy for the prevention and treatment of disruptive child behavior. Similar to most psychosocial interventions, it is unknown which components of parenting programs (ie, parenting techniques taught) actually contribute to program effects. Identifying what parents need to be taught to reduce disruptive child behavior can optimize intervention strategies, and refine theories on how parenting shapes disruptive child behavior. In two meta-analyses, we updated the evidence-base for effectiveness of parenting programs delivered at various levels of prevention and treatment of disruptive behavior. We searched six databases (eg, PsycINFO, MEDLINE) for randomized trials and coded the parenting techniques taught in each program. We identified the techniques associated with program effects in general, and for prevention versus treatment, and immediate versus longer-term effects, specifically. Parenting program effects on disruptive behavior gradually increased per level of prevention (universal d = -0.21, selective d = -0.27, indicated d = -0.55) and treatment (d = -0.69) (Meta-Analysis 1: 154 trials, 398 effect sizes). Three of 26 parenting techniques were associated with stronger program effects: positive reinforcement, praise in particular, and natural/logical consequences. Several additional techniques (eg, relationship building and parental self-management) were associated with stronger effects in treatment but weaker effects in prevention. No techniques were associated with stronger longer-term effects (Meta-Analysis 2: 42 trials, 157 effect sizes). Positive reinforcement and nonviolent discipline techniques (eg, applying natural/logical consequences) seem to be key parenting program techniques to reduce disruptive child behavior. Additional techniques (eg, parental self-management skills) might improve program effects in treatment, but not in prevention.

Background: Parenting programs aim to reduce children's conduct problems through improvement of family dynamics. To date, research on the precise benefits and possible harms of parenting programs on family well‐being has been unsystematic and likely to be subject to selective outcome reporting and publication bias. Better understanding of program benefits and harms requires full disclosure by researchers of all included measures, and large enough numbers of participants to be able to detect small effects and estimate them precisely. Methods: We obtained individual participant data for 14 of 15 randomized controlled trials on the Incredible Years parenting program in Europe (total N  =   1,799). We used multilevel modeling to estimate program effects on 13 parent‐reported outcomes, including parenting practices, children's mental health, and parental mental health. Results: Parental use of praise, corporal punishment, threats, and shouting improved, while parental use of tangible rewards, monitoring, or laxness did not. Children's conduct problems and attention deficit hyperactivity disorder (ADHD) symptoms improved, while emotional problems did not. Parental mental health (depressive symptoms, self‐efficacy, and stress) did not improve. There was no evidence of harmful effects. Conclusions: The Incredible Years parenting program improves the aspects of family well‐being that it is primarily designed to improve: parenting and children's conduct problems. It also improves parent‐reported ADHD symptoms in children. Wider benefits are limited: the program does not improve children's emotional problems or parental mental health. There are no signs of harm on any of the target outcomes.

Families with socioeconomically disadvantaged and ethnic minority backgrounds are often hard to reach for the prevention and treatment of disruptive child behavior problems. We examined whether the Incredible Years parenting intervention can successfully reach and benefit families with socioeconomic disadvantaged and ethnic minority backgrounds in the Netherlands. One hundred fifty-four families from a wide range of socioeconomic and ethnic backgrounds were recruited in an outpatient clinic for child and adolescent psychiatry and in elementary schools serving deprived neighborhoods. Families were randomly assigned to the BASIC Incredible Years parenting intervention or a waiting list control condition. Children were 3–8 years old (M = 5.59, SD = 1.35; 62% boys, 66% ethnic minorities) and 65% of the children met Diagnostic and Statistical Manual of Mental Disorders (4th ed., text rev.) criteria for oppositional defiant disorder, conduct disorder, and/or attention-deficit hyperactivity disorder. Incredible Years reduced parent-reported disruptive child behavior and teacher-reported hyperactive and inattentive child behavior and increased parent-reported use of praise and incentives and reduced harsh and inconsistent discipline. Incredible Years did not affect parent-reported hyperactive and inattentive child behavior; teacher-reported child conduct problems; and parent-reported use of appropriate discipline techniques, clear expectations, physical punishment, and parenting stress. Of importance, the effectiveness of Incredible Years did not differ across families with different socioeconomic and ethnic backgrounds. Effects were maintained at 3-month follow-up. This study shows that socioeconomically disadvantaged and ethnic minority families in disadvantaged neighborhoods can be engaged in and benefit from parenting interventions to reduce disruptive child behavior.

Violence against children affects over one billion children globally. International organisations promote parenting interventions as a main strategy to reduce violence against children. Parenting interventions have therefore been implemented rapidly across the globe. Yet, evidence for their longer-term effects remains unclear. We integrated global evidence to estimate effects over time of parenting interventions to reduce physical and emotional violence against children. In this systematic review and meta-analysis, we searched 26 databases and trial registries (14 non-English: Spanish, Chinese, Farsi, Russian, Thai) and conducted an extensive grey literature search up to August 01, 2022. We included randomised controlled trials (RCTs) of parenting interventions based on social learning theory for parents of children aged 2–10 years, without time or context restrictions. We critically appraised studies using Cochrane's Risk of Bias Tool. Data were synthesised using robust variance estimation meta-analyses. This study is registered with PROSPERO, CRD42019141844. We screened 44,411 records and included 346 RCTs. Sixty RCTs reported outcomes on physical or emotional violence. Trials were distributed across 22 countries (22% LMICs). Risk of bias was high for various domains. Outcome data ranged from 0 weeks to 2 years after the intervention, and was largely based on parent self-report. Parenting interventions reduced physical and emotional violent parenting behaviours immediately after the intervention (n = 42, k = 59; d = −0.46; 95% CI: −0.59, −0.33), at 1–6 months follow-up (n = 18, k = 31; d = −0.24; 95% CI: −0.37, −0.11) and at 7–24 months follow-up (n = 12, k = 19; d = −0.18; 95% CI: −0.34, −0.02), but effects were smaller over time. Our findings suggest that parenting interventions can reduce physical and emotional violence against children. Effects are maintained up to 24 months follow-up, but with diminished effect sizes. With global policy interest and imminent importance, research beyond 2 years and how effects can be better sustained over time is urgently needed. Student scholarship from the 10.13039/501100000269 Economic Social Research Council , Clarendon, and Wolfson Isaiah Berlin Fund.