title: Continuation and pregnancy rates with four contraceptive methods.
mesh_terms: D000293:Adolescent; D000328:Adult; D003267:Contraception; D003273:Contraceptive Devices / Q000009:adverse effects; D003276:Contraceptives, Oral / Q000009:adverse effects; D005006:Ethnicity; D005191:Family Characteristics; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007434:Intrauterine Devices; D008722:Methods; D010298:Parity; D011247:Pregnancy; D013223:Statistics as Topic; D013997:Time Factors
chemical_list: D003276:Contraceptives, Oral