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Findings extend existing data and suggest a relationship between culture and the development of ADHD, which might be mediated by parenting style.

The structure of the Woodcock-Johnson Cognitive Battery-Third Edition (WJ Cog) has been extensively explored via confirmatory factor analysis (CFA) with its normative sample, but there has been little research to verify that the same structure holds for students referred for special education services. Likewise, research on the structure of the WJ Cog with exploratory factor analysis (EFA) methods has been rare. Consequently, this study applied both EFA and CFA methods to the scores of 529 elementary school students referred for special education services (95.5% eligible) on the 14 tests of the WJ Cog extended battery. EFA results suggested only 2 or 3 factors, whereas CFA results favored the theoretical 7 factors posited by McGrew and Woodcock. In this theoretical model, a strong general factor accounted for 27% of the total variance and 57% of the common variance, whereas the 7 group factors combined accounted for 21% of the total variance and 43% of the common variance. Reliability, as quantified by ωH, was good for the general factor, marginal for the Gs factor, and poor for the other group factors. Nine of the 14 WJ Cog tests displayed uniqueness values that exceeded their communality. On the basis of this evidence from a referral sample, interpretation of the WJ Cog should be restricted to the Gs and g factors: the Gs factor because it exhibited considerable independence and precision of measurement and the g factor because it has emerged in all investigations of the WJ Cog.

In this study, the authors describe the development and subsequent validation of an attention-deficit/hyperactivity disorder (ADHD) scale for young adults. The authors constructed 2 parallel forms of the scale to assess items that relate directly to DSM-IV criteria. Each form comprised Inattention, Hyperactivity, and Impulsivity subscales. Confirmatory factor analyses were conducted to assess the dimensionality of the scale, and the hypothesized structure was confirmed. In addition, the measures obtained show that the scale possesses satisfactory reliability with regard to the level of internal consistency, and there was equivalence between the 2 parallel forms. Furthermore, the relevance of the scale's content and its relationship to other variables was adequate. In sum, sufficient evidence is provided regarding the validity of the measures obtained with the ADHD scale, thus illustrating that the scale could be a useful tool to assess the symptoms of ADHD in a sample of young adults from the United States.