Statistical evaluation of contraceptive methods.
D003267:Contraception; D003276:Contraceptives, Oral; D005069:Evaluation Studies as Topic; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007434:Intrauterine Devices; D011247:Pregnancy; D013223:Statistics as Topic; D013997:Time Factors
D003276:Contraceptives, Oral