title: Sex ratio, paternal age, and duration of marriage.
mesh_terms: D001315:Australia; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008393:Marriage; D010331:Paternal Age; D012744:Sex Ratio; D012725:Sexual Behavior; D013997:Time Factors; D014481:United States