The present investigation examined the ability of the Inventory of Home Stimulation (STIM) to predict changes in relative mental test performance of children between 6 months old and 36 months of age. The six STIM subscales were used in discriminant analysis to classify infants into three groups (gainers, stable, losers) in terms of their change…

This report presents national estimates of the intellectual development levels of noninstitutionalized children 6-11 years of age in the United States. These estimates were determined by scores on the Vocabulary and Block Design subtest of the WISC obtained in the Health Examination Survey of 1963-65. Findings are shown by age, sex, and grade in…