title: Changes in menstrual cycle length and regularity after use of oral contraceptives.
abstract: This is an analysis of changes in menstrual cycle length and regularity occurring for a group of 211 women who had discontinued use of oral contraceptives. The analysis is based on prospectively recorded histories from the Menstruation and Reproduction History Program. Post-pill menstrual cycle length and regularity are compared with pre-pill averages. In the first post-pill cycle, there was an average increase of 6 days in cycle length. In subsequent cycles, however, cycle length and regularity were comparable to pre-pill norms in most cases.
mesh_terms: D000328:Adult; D000568:Amenorrhea / Q000139:chemically induced; D003276:Contraceptives, Oral / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008572:Menarche; D008598:Menstruation / Q000187:drug effects*; D009839:Oligomenorrhea / Q000139:chemically induced; D011446:Prospective Studies; D012306:Risk; D013997:Time Factors
chemical_list: D003276:Contraceptives, Oral