One in three acutely ill hospitalized older adults who suffered hypo-active or mixed delirium died in the hospital. Clinicians should be aware that hypo-active symptoms of delirium, whether shown exclusively or in alternation with hyperactive symptoms, are indicative of a worse prognosis in this population. We included 1,409 admissions, with a mean age of 80 years. The proportion of in-hospital deaths was 19%, with a cumulative mortality of 38% in 12 months.

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