Vitamin D is not associated with cognitive status in a cohort of very old hospitalized patients.

Background/objective: The association between vitamin D levels and cognitive function remains a controversial issue especially in the very old, highly comorbid patients. We address the relative contribution of vitamin D when taking into account potential confounders well known to be involved in cognitive decline.

Methods: We investigated, in a prospective study of 428 very old inpatients from the Geneva geriatric hospital (mean age 85.