Using the Eysenck Personality Inventory, Extraversion and Neuroticism scores were obtained for 120 college students from two-child families. When the effects of birth order and sex of S were examined, a significant interaction occurred for Extraversion, with firstborn males and second-born females reporting higher scores. Higher Neuroticism scores occurred for Ss with opposite-sexed siblings than for those with the same-sexed sibling. Results suggest that Extraversion and Neuroticism are influenced by position in the two-child family.
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