Contraceptive practice in the context of a nonrestrictive abortion law: age-specific pregnancy rates in New York City, 1971-1973.
D000029:Abortion, Legal; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001723:Birth Rate; D003268:Contraception Behavior; D005260:Female; D005306:Fertilization; D006801:Humans; D009519:New York City; D011247:Pregnancy; D012111:Residence Characteristics