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We examined data from participants enrolled in longitudinal studies at the Washington University Alzheimer\u2019s Disease Research Center for associations between thyroid disease, thyroid hormone supplementation therapy, and subsequent development of dementia of the Alzheimer type (DAT). Data collected between April 1992 and June 2008 from 499 participants, 184 men and 315 women, were analyzed. Mean age was 76.9 years (SD = 9.2). At baseline, 61 participants reported thyroid medication use and 87 were identified as having a history of thyroid dysfunction. These participants progressed to a DAT diagnosis more rapidly than individuals not taking thyroid medication (hazard ratios [HR]: 1.67, 95% CI: 0.99-2.78, P = .054). Although an interesting trend was seen, baseline thyroid disease was not significantly (P = .093) associated with time to DAT diagnosis. Our findings suggest that utilization of thyroid medication may be associated with the development of DAT.<\/jats:p>","DOI":"10.1177\/0891988709342723","type":"journal-article","created":{"date-parts":[[2009,8,7]],"date-time":"2009-08-07T22:09:22Z","timestamp":1249682962000},"page":"63-69","source":"Crossref","is-referenced-by-count":11,"title":["Thyroid Medication Use and Subsequent Development of Dementia of the Alzheimer Type"],"prefix":"10.1177","volume":"23","author":[{"given":"Patrick C.","family":"Harper","sequence":"first","affiliation":[{"name":"Office for Research on Aging, St Louis College of Pharmacy, St Louis, Missouri,"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Catherine M.","family":"Roe","sequence":"additional","affiliation":[{"name":"Alzheimer's Disease Research Center and Department of Neurology, Washington University School of Medicine, St Louis, Missouri"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2009,8,7]]},"reference":[{"key":"atypb1","author":"Katzman R.","journal-title":"Alzheimers Dement"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.67.6.779"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM199911253412207"},{"key":"atypb4","doi-asserted-by":"publisher","DOI":"10.1016\/j.jalz.2006.05.1408"},{"key":"atypb5","doi-asserted-by":"publisher","DOI":"10.1016\/j.jalz.2005.06.337"},{"key":"atypb6","volume-title":"Levothyroxine. 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