Abstract
Sex differences in intellectual development between the ages 10 and 13 were studied for a normal group (n = 855) of boys and girls, and for groups subjected to changes in the home (n = 31) or school (n = 39) situation during the interval. As compared to a normal group, a significant impairment of the scores on tests of Inductive ability, Spatial ability, and Achievement in mathematics was found for boys who lost a parent during the interval. No significant impairment was found for girls or for groups that were subjected to changes in the school situation. Methodological problems in studying sex differences in intellectual development were also discussed, and a method using within-sex comparisons was suggested.

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