Ordinal position, sex of sibling, sex, and personal preferences in a group of eighteen-year-olds.
D000293:Adolescent; D001722:Birth Order; D005260:Female; D006126:Group Processes; D006801:Humans; D008297:Male; D010553:Personality Development; D012737:Sex Factors; D012801:Sibling Relations; D012919:Social Behavior