{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T21:05:14Z","timestamp":1790111114633,"version":"4.0.1"},"reference-count":20,"publisher":"BMJ","issue":"11","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Epidemiol Community Health"],"published-print":{"date-parts":[[2006,11]]},"abstract":"<jats:p>\n                  <jats:bold>Objective:<\/jats:bold> 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.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Design:<\/jats:bold> Prospective birth cohort study.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Setting:<\/jats:bold> England, Scotland and Wales.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Participants:<\/jats:bold> 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.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Results:<\/jats:bold> By calculating the limits of agreement, \u03ba statistic and Pearson\u2019s 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 (\u03ba\u200a=\u200a0.35, r\u200a=\u200a0.66, n\u200a=\u200a1050). Validity was improved by categorising age at menarche into three groups: early, normal and late (\u03ba\u200a=\u200a0.43). Agreement was influenced by educational level and having had a stillbirth or miscarriage.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Conclusions:<\/jats:bold> 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.<\/jats:p>","DOI":"10.1136\/jech.2005.043182","type":"journal-article","created":{"date-parts":[[2006,10,19]],"date-time":"2006-10-19T20:41:19Z","timestamp":1161290479000},"page":"993-997","source":"Crossref","is-referenced-by-count":174,"title":["Validity of age at menarche self-reported in adulthood"],"prefix":"10.1136","volume":"60","author":[{"given":"R","family":"Cooper","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Blell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R","family":"Hardy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S","family":"Black","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T M","family":"Pollard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M E J","family":"Wadsworth","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M S","family":"Pearce","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D","family":"Kuh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2006,10,19]]},"reference":[{"key":"2025100522084430000_60.11.993.1","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/31.2.405"},{"key":"2025100522084430000_60.11.993.2","doi-asserted-by":"publisher","DOI":"10.1542\/peds.107.4.e59"},{"key":"2025100522084430000_60.11.993.3","doi-asserted-by":"crossref","unstructured":"Potischman N, Troisi R, Vatten L. 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