title: Validity of age at menarche self-reported in adulthood.
abstract: OBJECTIVE
  To test the validity of age at menarche self-reported in adulthood and examine whether socioeconomic position, education, experience of gynaecological events and psychological symptoms influence the accuracy of recall.
  
  
  METHODS
  Prospective birth cohort study.
  
  
  METHODS
  England, Scotland and Wales.
  
  
  METHODS
  1050 women from the Medical Research Council National Survey of Health and Development, with two measures of age at menarche, one recorded in adolescence and the other self-reported at age 48 years.
  
  
  RESULTS
  By calculating the limits of agreement, kappa statistic and Pearson's correlation coefficients (r), we found that the validity of age at menarche self-reported in middle age compared with that recorded in adolescence was moderate (kappa = 0.35, r = 0.66, n = 1050). Validity was improved by categorising age at menarche into three groups: early, normal and late (kappa = 0.43). Agreement was influenced by educational level and having had a stillbirth or miscarriage.
  
  
  CONCLUSIONS
  The level of validity shown in this study throws some doubt on whether it is justifiable to use age at menarche self-reported in middle age. It is likely to introduce error and bias, and researchers should be aware of these limitations and use such measures with caution.
authors.affiliation: MRC National Survey of Health and Development, Department of Epidemiology and Public Health, University College London, London, UK. rachel.cooper@ucl.ac.uk
authors.forename: R
authors.initials: R
authors.lastname: Cooper
authors.forename: M
authors.initials: M
authors.lastname: Blell
authors.forename: R
authors.initials: R
authors.lastname: Hardy
authors.forename: S
authors.initials: S
authors.lastname: Black
authors.forename: T M
authors.initials: TM
authors.lastname: Pollard
authors.forename: M E J
authors.initials: ME
authors.lastname: Wadsworth
authors.forename: M S
authors.initials: MS
authors.lastname: Pearce
authors.forename: D
authors.initials: D
authors.lastname: Kuh
mesh_terms: D000022:Abortion, Spontaneous; D000293:Adolescent; D000367:Age Factors; D004522:Educational Status; D005260:Female; D006306:Health Surveys; D006801:Humans; D008572:Menarche; D001523:Mental Disorders / Q000523:psychology; D011939:Mental Recall; D008875:Middle Aged; D011446:Prospective Studies; D015203:Reproducibility of Results; D012923:Social Class; D050497:Stillbirth