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This study goal was to describe the effect of severity of prior cognitive impairment on delirium prevalence and symptom presentation among patients who were older and were newly admitted to an acute care hospital. A total of 104 were included in this descriptive study and screened for delirium. The results showed that the prevalence of delirium increased according to the severity of the patients\u2019 prior cognitive impairment. Except for disorganized thinking, all symptoms of delirium were similar among patients with mild, moderate, and severe prior cognitive impairment. 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