{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,3]],"date-time":"2026-11-03T17:28:35Z","timestamp":1793726915261,"version":"4.6.1"},"reference-count":26,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2006,11,13]],"date-time":"2006-11-13T00:00:00Z","timestamp":1163376000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Euro J of Neurology"],"published-print":{"date-parts":[[2006,12]]},"abstract":"<jats:p>Epidemiological data show a higher prevalence of late\u2010onset Alzheimer's disease (AD) in women. The estrogenic deficiency in the post\u2010menopausal period is suspected to be the cause of the gender\u2010related risk of the disease, but studies on the estrogenic therapy and occurrence of AD were not consistent and sometimes contradicting. The aim of this study is to investigate whether a higher exposure to endogenous estrogens is associated with lower risk of dementia or not. Two hundred and four AD patients and 201 control women were considered. By interviews, we evaluated different variables, indirectly correlated to estrogenic natural exposure, as well as educational level and head trauma. These data were correlated in the AD group with the disease progression, as well as with the age at onset. Unexpectedly, we found a significant higher number of pregnancies in the AD than in the control group. Within the AD cases, the number of lifetime pregnancies is related to an earlier onset of the disease. As previously reported, we confirmed that the educational level is a protective factor and that major head trauma represents a risk factor in developing AD. The higher number of pregnancies and a less frequency of nulliparous women, indirectly relate the AD group to a higher estro\u2010progestinic exposure. These findings suggest that it is the increase of progesterone or estrogens level \u2013 and not the estrogens decrease, as previously indicated by other authors \u2013 that could play a role in the Alzheimer's pathology.<\/jats:p>","DOI":"10.1111\/j.1468-1331.2006.01520.x","type":"journal-article","created":{"date-parts":[[2006,11,13]],"date-time":"2006-11-13T13:04:51Z","timestamp":1163423091000},"page":"1374-1377","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":115,"title":["The number of pregnancies is a risk factor for Alzheimer's 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