title: A multivariate analysis of the relationship between parental age and birth order and the human secondary sex ratio.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001722:Birth Order; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D008875:Middle Aged; D009518:New York; D010290:Parents; D012044:Regression Analysis; D012744:Sex Ratio