title: Firstborns, only children, sex, and three dependency measures.
mesh_terms: D001722:Birth Order; D005260:Female; D005364:Field Dependence-Independence; D006801:Humans; D008297:Male; D009863:Only Child; D010551:Personality; D011581:Psychological Tests; D012737:Sex Factors; D012930:Social Dominance; D013997:Time Factors