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Surveys with full diagnostic evaluations of dementia prevalence are prohibitively resource-intensive in many settings. However, validation samples from nationally representative surveys allow for the development of algorithms for the prediction of dementia prevalence nationally.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Using cognitive testing data and data on functional limitations from Wave A (2001\u20132003) of the ADAMS study (<jats:italic>n<\/jats:italic>\u2009=\u2009744) and the 2000 wave of the HRS study (<jats:italic>n<\/jats:italic>\u2009=\u20096358) we estimated a two-dimensional item response theory model to calculate cognition and function scores for all individuals over 70. Based on diagnostic information from the formal clinical adjudication in ADAMS, we fit a logistic regression model for the classification of dementia status using cognition and function scores and applied this algorithm to the full HRS sample to calculate dementia prevalence by age and sex.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Our algorithm had a cross-validated predictive accuracy of 88% (86\u201390), and an area under the curve of 0.97 (0.97\u20130.98) in ADAMS. Prevalence was higher in females than males and increased over age, with a prevalence of 4% (3\u20134) in individuals 70\u201379, 11% (9\u201312) in individuals 80\u201389\u00a0years old, and 28% (22\u201335) in those 90 and older.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Our model had similar or better accuracy as compared to previously reviewed algorithms for the prediction of dementia prevalence in HRS, while utilizing more flexible methods. These methods could be more easily generalized and utilized to estimate dementia prevalence in other national surveys.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12911-021-01590-y","type":"journal-article","created":{"date-parts":[[2021,8,11]],"date-time":"2021-08-11T11:10:28Z","timestamp":1628680228000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Use of multidimensional item response theory methods for dementia prevalence prediction: an example using the Health and Retirement Survey and the Aging, Demographics, and Memory Study"],"prefix":"10.1186","volume":"21","author":[{"name":"GBD 2019 Dementia Collaborators","sequence":"first","affiliation":[]},{"given":"Emma","family":"Nichols","sequence":"additional","affiliation":[]},{"given":"Foad","family":"Abd-Allah","sequence":"additional","affiliation":[]},{"given":"Amir","family":"Abdoli","sequence":"additional","affiliation":[]},{"given":"Ahmed","family":"Abualhasan","sequence":"additional","affiliation":[]},{"given":"Eman","family":"Abu-Gharbieh","sequence":"additional","affiliation":[]},{"given":"Ashkan","family":"Afshin","sequence":"additional","affiliation":[]},{"given":"Rufus Olusola","family":"Akinyemi","sequence":"additional","affiliation":[]},{"given":"Fahad Mashhour","family":"Alanezi","sequence":"additional","affiliation":[]},{"given":"Vahid","family":"Alipour","sequence":"additional","affiliation":[]},{"given":"Amir","family":"Almasi-Hashiani","sequence":"additional","affiliation":[]},{"given":"Jalal","family":"Arabloo","sequence":"additional","affiliation":[]},{"given":"Amir","family":"Ashraf-Ganjouei","sequence":"additional","affiliation":[]},{"given":"Getinet","family":"Ayano","sequence":"additional","affiliation":[]},{"given":"Jose L.","family":"Ayuso-Mateos","sequence":"additional","affiliation":[]},{"given":"Atif Amin","family":"Baig","sequence":"additional","affiliation":[]},{"given":"Maciej","family":"Banach","sequence":"additional","affiliation":[]},{"given":"Miguel A.","family":"Barboza","sequence":"additional","affiliation":[]},{"given":"Suzanne Lyn","family":"Barker-Collo","sequence":"additional","affiliation":[]},{"given":"Bernhard T.","family":"Baune","sequence":"additional","affiliation":[]},{"given":"Akshaya Srikanth","family":"Bhagavathula","sequence":"additional","affiliation":[]},{"given":"Krittika","family":"Bhattacharyya","sequence":"additional","affiliation":[]},{"given":"Ali","family":"Bijani","sequence":"additional","affiliation":[]},{"given":"Atanu","family":"Biswas","sequence":"additional","affiliation":[]},{"given":"Archith","family":"Boloor","sequence":"additional","affiliation":[]},{"given":"Carol","family":"Brayne","sequence":"additional","affiliation":[]},{"given":"Hermann","family":"Brenner","sequence":"additional","affiliation":[]},{"given":"Katrin","family":"Burkart","sequence":"additional","affiliation":[]},{"given":"Sharath","family":"Burugina Nagaraja","sequence":"additional","affiliation":[]},{"given":"Felix","family":"Carvalho","sequence":"additional","affiliation":[]},{"given":"Luis F. 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Mika Kivim\u00e4ki reports Grants from Medical Research Council (MR\/S011676, MR\/R024227), US National Institute on Aging (R01AG062553, R01AG056477), and NordForsk (75021), outside the submitted work. Constance Dimity Pond reports personal fees from Nutricia, outside the submitted work, and received Grants from the National Medical Research council in relation to dementia, and travel Grants and remuneration related to education of primary care professionals in relation to dementia. Perminder S Sachdev reports Grants from National Health and Medical Research Council, and NIA\/NIH, during the conduct of the study, and personal fees from Biogen Australia, outside the submitted work. Mete Saylan reports being an employee of Bayer AG. Jasvinder A Singh reports personal fees from Crealta\/Horizon, Medisys, Fidia, UBM LLC, Trio health, Medscape, WebMD, Clinical Care options, Clearview healthcare partners, Putnam associates, Focus forward, Navigant consulting, Spherix, Practice Point communications, the National Institutes of Health and the American College of Rheumatology, and from Simply Speaking; owning stock options in Amarin, Viking, Moderna and Vaxart pharmaceuticals and Charlotte\u2019s Web Holdings; membership in the FDA Arthritis Advisory Committee, the Steering committee of OMERACT, an international organization that develops measures for clinical trials and receives arm\u2019s length funding from 12 pharmaceutical companies, and the Veterans Affairs Rheumatology Field Advisory Committee, and acting as Editor and the Director of the UAB Cochrane Musculoskeletal Group Satellite Center on Network Meta-analysis, all outside the submitted work. Anders Wimo reports personal fees from WHO, and non-financial support from ADI, during the conduct of the study; Grants from MSD, and personal fees from Biogen, outside the submitted work.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"241"}}