Abstract
Two samples of National Merit Scholarship participants test in 1962 and the entire population of almost 800000 participants tested in 1965 were examined. Consistent effects in all 3 groups were observed with respect to both birth order and family size (1st born and those of smaller families scored higher). Control of both socioeconomic variables and maternal age by analysis of variance as well as by analysis of covariance failed to alter the relationships. Stepdown analyses suggested that the effects were due to a verbal component and that no differences were attributable to nonverbal factors. Mean test scores were computed for detailed sibship configurations based on birth order family size sibling spacing and sibling sex. (authors modified)
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