Association between vitamin B12 levels and mortality in hospitalized older adults.

Objectives: To investigate the effect of various medications on vitamin B12 status and the association between vitamin B12 levels and mortality.

Design: Retrospective cross-sectional study.

Setting: Four internal medicine departments and the geriatrics department at Kaplan Medical Center (KMC), Rehovot and Harzfeld Geriatrics Hospital, Gedera, Israel.