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OBJECTIVE: To evaluate both the occurrence and the factors associated with the use of PIM in elderly patients who were treated in the Department of Geriatrics in West China Hospital.METHODS: This is a retrospective cross-sectional study.A large scale cohort of 1796 men and women aged 65 and over were recruited who were discharged from the geriatric wards of West China Hospital from October 2012 to April 2013.2012 Update Beers Criteria by the American Geriatric Society were applied to assess the use of PIM among the investigated samples.