title: Genetic and environmental variation in menstrual cycle: histories of two British twin samples.
abstract: Information about menstrual cycle variables was obtained by questionnaire using 462 female twin pairs. The twins were either members of the Institute of Psychiatry Volunteer Twin Register, or of the Birmingham Population-based Register. The two samples were analysed separately using univariate and multivariate methods so that an independent replication was obtained. Maximum likelihood estimation was used to fit simple models of genetic and environmental variation to these data. The results suggest that age of menarche, menstrual cycle regularity and premenstrual symptom reporting may be heritable, whereas menstrual cycle length is not. The result should be interpreted with caution as not all variables were replicated in the smaller sample, and the method of retrospective menstrual cycle data collection has been questioned.
authors.affiliation: Institute of Psychiatry, University of London, UK.
authors.forename: O B
authors.initials: OB
authors.lastname: van den Akker
authors.forename: G S
authors.initials: GS
authors.lastname: Stein
authors.forename: M C
authors.initials: MC
authors.lastname: Neale
authors.forename: R M
authors.initials: RM
authors.lastname: Murray
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D004200:Diseases in Twins; D004739:England; D004777:Environment; D005260:Female; D014644:Genetic Variation; D006801:Humans; D008572:Menarche; D008597:Menstrual Cycle; D008875:Middle Aged; D011293:Premenstrual Syndrome / Q000235:genetics; D012189:Retrospective Studies; D014427:Twins