Association between hemoglobin A1c variability and hypoglycemia-related hospitalizations in veterans with diabetes mellitus.

Introduction: To study the impact of hemoglobin A1c (A1c) variability on the risk of hypoglycemia-related hospitalization (HRH) in veterans with diabetes mellitus.

Research Design And Methods: 342 059 veterans with diabetes aged 65 years or older were identified for a retrospective cohort study. All participants had a 3-year baseline period from January 1, 2005 to December 31, 2016, during which they had at least four A1c tests.