{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T03:45:57Z","timestamp":1790912757671,"version":"4.1.0"},"reference-count":63,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2024,2,6]],"date-time":"2024-02-06T00:00:00Z","timestamp":1707177600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"funder":[{"DOI":"10.13039\/501100021078","name":"Norwegian Institute of Public Health","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100021078","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100013958","name":"Telemark Hospital Trust","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100013958","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005416","name":"Research Council of Norway","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100005416","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005416","name":"Research Council of Norway","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100005416","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000780","name":"European Union","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100000780","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000780","name":"European Union","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100000780","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010663","name":"European Research Council","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010663","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010663","name":"European Research Council","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010663","id-type":"DOI","asserted-by":"publisher"}]},{"name":"European Union\u2019s Horizon 2020"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,4,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>STUDY QUESTION<\/jats:title>\n                  <jats:p>Is age at menarche associated with fecundability?<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>SUMMARY ANSWER<\/jats:title>\n                  <jats:p>Both early (&amp;lt;11\u2009years) and late (&amp;gt;15\u2009years) menarche is associated with decreased fecundability.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>WHAT IS KNOWN ALREADY<\/jats:title>\n                  <jats:p>Previous studies on age at menarche and fecundability have been inconclusive. Women with early or late menarche are at increased risks of gynaecological and autoimmune diseases that may affect their ability to conceive.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>STUDY DESIGN, SIZE, DURATION<\/jats:title>\n                  <jats:p>We conducted a retrospective cohort study including 67\u200a613 pregnant women, participating in the Norwegian Mother, Father and Child Cohort Study between 1999 and 2008, with self-reported information on age at menarche and time to pregnancy. We included planned pregnancies that were conceived either naturally or with the help of assisted reproductive technologies.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>PARTICIPANTS\/MATERIALS, SETTING, METHODS<\/jats:title>\n                  <jats:p>We calculated fecundability ratios (FRs) with 95% CIs representing the cycle-specific probability of conception by categories of age at menarche. FRs were adjusted for participants\u2019 pre-pregnancy body mass index, highest completed or ongoing education level, and age at initiation of trying to conceive.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>MAIN RESULTS AND THE ROLE OF CHANCE<\/jats:title>\n                  <jats:p>We observed a 7% lower probability of conceiving during any given menstrual cycle up to 12 cycles in women with early or late menarche. Among women with menarche &amp;gt;15\u2009years, the adjusted FR was 0.93 (95% CI: 0.90\u20130.97), and among women with menarche &amp;lt;11\u2009years, the adjusted FR was 0.93 (95% CI: 0.89\u20130.99), when compared to women with menarche between 12 and 14\u2009years.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>LIMITATIONS, REASONS FOR CAUTION<\/jats:title>\n                  <jats:p>The study-population consisted of women pregnant in their second trimester, excluding those with persistent infertility. Recall of age at menarche and time to pregnancy may be inaccurate.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>WIDER IMPLICATIONS OF THE FINDINGS<\/jats:title>\n                  <jats:p>Both early (&amp;lt;11\u2009years) and late (&amp;gt;15\u2009years) menarche was associated with decreased fecundability. Women experiencing early menarche or late menarche may be counselled accordingly.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>STUDY FUNDING\/COMPETING INTEREST(S)<\/jats:title>\n                  <jats:p>This study was funded by the Norwegian Institute of Public Health, Oslo, Norway, and by Telemark Hospital Trust, Porsgrunn, Norway and was partly supported by the Research Council of Norway through its centres of excellence funding scheme (project number 262700) and the Research Council of Norway (project no. 320656). The project was co-funded by the European Union (ERC, BIOSFER, 101071773). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them. M.C.M. has received funding from the European Research Council (ERC) under the European Union\u2019s Horizon 2020 research and innovation program (grant agreement no. 947684). The authors report no competing interests.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>TRIAL REGISTRATION NUMBER<\/jats:title>\n                  <jats:p>N\/A.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/humrep\/deae011","type":"journal-article","created":{"date-parts":[[2024,2,7]],"date-time":"2024-02-07T10:32:52Z","timestamp":1707301972000},"page":"812-821","source":"Crossref","is-referenced-by-count":13,"title":["Early or late menarche is associated with reduced fecundability in the Norwegian Mother, Father and Child Cohort Study"],"prefix":"10.1093","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-7613-6880","authenticated-orcid":false,"given":"M L","family":"Warp","sequence":"first","affiliation":[{"name":"Telemark Hospital Trust, Fertility Department Soer , Porsgrunn, Norway"},{"name":"Centre for Fertility and Health, Norwegian Institute of Public Health , Oslo, Norway"},{"name":"Department of Clinical Science, University of Bergen , Bergen, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T","family":"Grindstad","sequence":"additional","affiliation":[{"name":"Centre for Fertility and Health, Norwegian Institute of Public Health , Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0568-3774","authenticated-orcid":false,"given":"M C","family":"Magnus","sequence":"additional","affiliation":[{"name":"Centre for Fertility and Health, Norwegian Institute of Public Health , Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C M","family":"Page","sequence":"additional","affiliation":[{"name":"Department of Physical Health and Ageing, Norwegian Institute of Public Health , Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2199-5225","authenticated-orcid":false,"given":"S 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