Our comprehensive meta-analysis combined prevalence figures of childhood sexual abuse (CSA) reported in 217 publications published between 1980 and 2008, including 331 independent samples with a total of 9,911,748 participants. The overall estimated CSA prevalence was 127/1000 in self-report studies and 4/1000 in informant studies. Self-reported CSA was more common among female (180/1000) than among male participants (76/1000). Lowest rates for both girls (113/1000) and boys (41/1000) were found in Asia, and highest rates were found for girls in Australia (215/1000) and for boys in Africa (193/1000). The results of our meta-analysis confirm that CSA is a global problem of considerable extent, but also show that methodological issues drastically influence the self-reported prevalence of CSA.

In this review, we combine and compare the results of a series of meta‐analyses on the prevalence of child sexual, physical and emotional abuse and physical and emotional neglect, including 244 publications and 551 prevalence rates for the various types of maltreatment. Child maltreatment research seems to be dominated by research on sexual abuse, studies in developed parts of the world and research using self‐report measures. The overall estimated prevalence rates for self‐report studies (mainly assessing maltreatment ever during childhood) were 127/1000 for sexual abuse (76/1000 among boys and 180/1000 among girls), 226/1000 for physical abuse, 363/1000 for emotional abuse, 163/1000 for physical neglect and 184/1000 for emotional neglect. The overall estimated prevalence rates for studies using informants (mainly assessing the 1‐year prevalence of maltreatment) were four per 1000 for sexual abuse and three per 1000, respectively, for physical abuse and emotional abuse. We conclude that child maltreatment is a widespread, global phenomenon affecting the lives of millions of children all over the world, which is in sharp contrast with the United Nation's Convention on the Rights of the Child. Copyright © 2014 John Wiley & Sons, Ltd. Key Practitioner Messages: Child maltreatment research is dominated by research on sexual abuse. The prevalence rates for informant studies were lower than for self‐report studies. The prevalence of child maltreatment is largely similar across the globe.

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Our comprehensive meta-analysis combined prevalence figures of child physical abuse reported in 111 studies, including 168 independent samples with a total of 9,698,801 participants. The overall estimated prevalence was 3/1000 for studies using informants and 226/1000 for studies using self-report measures of child physical abuse, with no apparent gender differences. Methodological factors partly explained the vast variation of self-reported prevalence rates in individual studies. The highest prevalence rates were found for studies using a broad definition of child physical abuse, studies measuring physical abuse over the longest period of 0-18 years, studies using college samples, studies in which adults served as respondents, and studies using more questions on physical abuse. Cultural-geographical factors did not seem to affect prevalence rates of physical abuse, which may be partly due to procedural factors. More crosscultural research on physical abuse is badly needed, especially in Africa and South America. We conclude that child physical abuse is a widespread, global phenomenon affecting the lives of millions of children all over the world, which is in sharp contrast with the United Nation's Convention on the Rights of the Child.

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BackgroundConsistent findings about the effectiveness of parent programs to prevent or reduce child maltreatment are lacking.MethodsIn the present meta-analysis we synthesized findings from 27 independent samples from randomized controlled trials (RCTs) on the effectiveness of 20 different intervention programs aimed at (i) preventing the occurrence of child maltreatment in the general population or with at-risk but non-maltreating families, or (ii) reducing the incidence of child maltreatment in maltreating families.ResultsA significant combined effect on maltreatment (d = 0.13; N = 4883) disappeared after the trim-and-fill approach that takes into account publication bias against smaller studies without significant outcomes. However, moderator analyses showed that larger effect sizes were found for more recent studies, studies with smaller samples, programs that provide parent training instead of only support, programs that target maltreating instead of at-risk families, and programs with a moderate length (6–12 months) or a moderate number of sessions (16–30).ConclusionsMore RCTs are needed to further unravel which factors are associated with program effectiveness. Because currently existing programs appeared to only reduce and not prevent child maltreatment, efforts in the field of preventive intervention should also focus on the development and testing of preventive programs for families at risk for child maltreatment.Electronic supplementary materialThe online version of this article (doi:10.1186/s12889-015-2387-9) contains supplementary material, which is available to authorized users.

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Insight into the effects of methodological characteristics on reported child maltreatment prevalence rates can facilitate the interpretation of results of previous studies and improve the design of future prevalence studies. We reviewed findings from four previous meta‐analyses (Stoltenborgh et al., , , , ) on methodological moderators in self‐report prevalence studies on child sexual (k = 323, N = 410,951), physical (k = 157, N = 250,167) and emotional abuse (k = 42, N = 76,586), and physical (k = 13, N = 59 406) and emotional neglect (k = 16, N = 59 655). We provide an overview of the moderating effects of participant characteristics (e.g. age), the sampling method and measurement characteristics (e.g. validation). No characteristic was without influence, but specific characteristics were significant moderators for certain types of abuse and not for others. This implies that the wide range of lifetime prevalence rates reported in the literature can partly be explained by methodological differences. Our best‐evidence synthesis (sexual abuse: k = 4, N = 52 749; physical abuse: k = 2, N = 40 341; emotional abuse: k = 6, N = 4029; emotional neglect: k = 3, N = 3226) suggests that depending on the methodological characteristic under consideration a certain prevalence rate can be an over‐ or underestimation of the actual prevalence. Taking methodological characteristics' influence into consideration and choosing a sound methodology can help to get as close as possible to the actual child maltreatment prevalence. Copyright © 2016 John Wiley & Sons, Ltd. Key Practitioner Messages The methodological quality of studies affects the reported lifetime prevalence rates of child maltreatment, but the direction of this effect depends on the indicator of methodological quality. A higher response rate is related to a higher reported lifetime prevalence of child maltreatment for all maltreatment types except physical abuse. A sound study design and methodology can help researchers to get as close as possible to the actual lifetime prevalence of child maltreatment.