Longitudinal studies provide developmental science with invaluable information about how variables and the associations between variables change across time, but typically give limited attention to the length of time over which that change occurs. The present study re-analyzed data from previously published meta-analyses of longitudinal data…

The field of cognitive training (CT) has been researched for over a century. However, there is still a debate regarding its ability to produce cognitive improvement, especially in working memory (WM) indices. This meta-analysis examined whether there is an advantage in training gains by comparing the results of two specific WM training approaches,…

This article presents the results of a systematic review of methods that have been used to measure or assess metacognition in children aged 4-16 years over a 20-year period (1992-2012). It includes an overview of the types of tool and methods used linked with the ages of the participants targeted and how metacognition and associated concepts are…

This dissertation presents the results of a meta-analysis of the empirical literature on delinquent behavior among children with learning disabilities in comparison to their non-learning disabled peers. Twenty-four studies met inclusion criteria and results indicated that children with learning disabilities (n = 3,202) have higher mean scores on…

Rates and onset of regression were meta-analyzed from 85 articles representing 29,035 participants with autism spectrum disorders (ASD). Overall prevalence rate for regression was 32.1, 95% CI [29.5, 34.8] occurring at mean of 1.78 years, 95% CI [1.67, 1.89]. Regression prevalence rates differed according to four types of regression: language…

This meta-analysis used hierarchical linear modeling to examine 115 single-case studies with 343 participants that examined the effectiveness of social skills interventions for individuals with autism spectrum disorder (ASD). The average effect size of the included studies was 1.40 (SD = 0.43, 95% CL = 1.32-1.48, N = 115). In the further, several…

Self-handicapping represents a frequently used strategy for regulating the threat to self-esteem elicited by the fear of failing in academic achievement settings. Several studies have documented negative associations between self-handicapping and different educational outcomes, inter alia academic achievement. However, studies on the relation…

Objective: This study investigated how study type, mean patient age, and amount of contact with research staff affected response rates to medication and placebo in acute antidepressant trials for pediatric depression. Method: Data were extracted from nine open, four active comparator, and 18 placebo-controlled studies of antidepressants for…

This meta-analysis examined school-based intervention research based on functional behavioral assessment (FBA) to determine the effectiveness of key individualized positive behavior support (IPBS) practices in school settings. In all, 83 studies representing 145 participants were included in the meta-analysis. Intervention, maintenance, and…

Intellectual disability is an extremely stigmatizing condition and involves utilization of large public health resources, but most data about its burden is based on studies conducted in developed countries. The aim of this meta-analysis was to collate data from published literature and estimate the prevalence of intellectual disability across all…

Attachment theory suggests that children's attachment insecurity plays a key role in the development of anxiety. In the present study we evaluated the empirical evidence for the link between insecure attachment and anxiety from early childhood to adolescence. A meta-analysis of 46 studies, from 1984 to 2010, including 8,907 children, was…

This meta-analysis addresses whether achievement goal researchers are using different labels for the same constructs or putting the same labels on different constructs. We systematically examined whether conceptual and methodological differences in the measurement of achievement goals moderated achievement goal intercorrelations and relationships…

This article summarizes research examining the relationship between the constructs of ethnic identity and personal well-being among people of color in North America. Data from 184 studies analyzed with random effects models yielded an omnibus effect size of r = 0.17, suggesting a modest relationship between the 2 constructs. The relationship was…

Behavioral genetic research has concluded that the more important environmental influences result in differences between siblings (referred to as "nonshared"; "e[superscript 2]"), whereas environmental influences that create similarities between siblings (referred to as "shared"; "c[superscript 2]") are indistinguishable from zero. However, there…

In recent years, there has been a surge in the quantity of media content that glorifies risk-taking behavior, such as risky driving, extreme sports, or binge drinking. The authors conducted a meta-analysis involving more than 80,000 participants and 105 independent effect sizes to examine whether exposure to such media depictions increased their…