This meta-analysis reviews 79 studies (N = 46,605) that examined the existence of gender difference on intelligence in school-aged children. To do so, we limited the literature search to works that assessed the construct of intelligence through the Wechsler Intelligence Scales for Children (WISC) batteries, evaluating eventual gender differences…

We compared the Wechsler scores of individuals with twice-exceptionality (2e) and giftedness using a three-level Bayesian meta-analysis. Ninety-five effect sizes were calculated from 15 studies (n = 2,106). Results show that individuals with 2e who have learning disabilities perform lower than individuals with giftedness in Full-Scale Intelligence…

Intelligence tests and adaptive behavior scales measure vital aspects of the multidimensional nature of human functioning. Assessment of each is a required component in the diagnosis or identification of intellectual disability, and both are frequently used conjointly in the assessment and identification of other developmental disabilities. The…

IQ test scores should be corrected for high stakes decisions that employ these assessments, including capital offense cases. If scores are not corrected, then diagnostic standards must change with each generation. Arguments against corrections, based on standards of practice, information present and absent in test manuals, and related issues,…

Objective: To characterize the relationship between IQ and attention deficits in children with ADHD and to estimate the inattention-related mean influence on IQ when children are tested before stimulant drug treatment has been initiated. Method: Studies of various methodologies are reviewed. Results: Correlation studies show mostly weak…

In this meta-analysis of 75 studies on more than 3,888 children in 19 different countries, the intellectual development of children living in children's homes (orphanages) was compared with that of children living with their (foster) families. Children growing up in children's homes showed lower IQ's than did children growing up in a family…

A systematic literature search for studies reporting effects of Early Intensive Behavioral Intervention identified 34 studies, 9 of which were controlled designs having either a comparison or a control group. We completed a meta-analysis yielding a standardized mean difference effect size for two available outcome measures: change in full-scale…

The original authors respond to a critique of their meta-analysis of 94 studies which had failed to support the presence of distinctive Wechsler Intelligence Scale for Children profiles for learning disabled children. The critique contended such a pattern does exist. (Author/DB)

As part of a continuing dialog concerning the validity of a meta-analysis of 94 studies suggesting that there is a lack of any distinctive pattern in the Wechsler Intelligence Scale for Children (Revised) profiles for learning disabled children, this article maintains the view that such differences do exist. (DB)

Reports a study using meta-analytical procedures to compare WISC-R subtest performance patterns of 29 samples of retarded, average, and above average intelligence children. Shows how the study results in distinct WISC-R profiles for each group and demonstrates how the subtest performance patterns are strongly related to overall intellectual level.…

Reanalysis of data derived from a meta-analysis of the Wechsler Intelligence Scale for Children-Revised, using a learning disability index derived from a principal-components analysis, found that the test discriminated reliably between 9,372 learning-disabled children and their non-disabled peers. (Author/CB)

In spite of massive research efforts, no clear conclusions have been reached with regard to whether specific exceptional groups demonstrate Wechsler Intelligence Scale for Children-Revised (WISC-R) profiles that reliably differentiate them from normative or other exceptional groups. This study applied multivariate clustering and profile analysis…