title: Epidemiology of secondary amenorrhea. I. Incidence and prevalence rates.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000568:Amenorrhea / Q000139:chemically induced / Q000453:epidemiology* / Q000209:etiology; D003276:Contraceptives, Oral / Q000009:adverse effects / Q000494:pharmacology; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008393:Marriage; D008572:Menarche; D008875:Middle Aged; D010298:Parity; D011247:Pregnancy; D012111:Residence Characteristics; D012189:Retrospective Studies; D012494:Sampling Studies; D012907:Smoking / Q000150:complications; D012959:Socioeconomic Factors; D013548:Sweden
chemical_list: D003276:Contraceptives, Oral