A critique of the national fertility study.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D003267:Contraception; D005191:Family Characteristics; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D005306:Fertilization; D006801:Humans; D008297:Male; D008393:Marriage; D011153:Population; D011247:Pregnancy; D012737:Sex Factors; D012725:Sexual Behavior; D013997:Time Factors; D014481:United States