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We investigated the risk of type 2 diabetes mellitus (T2DM) in patients with and without insomnia.

In this historical cohort study, we performed a secondary analysis of data from 2001 to 2010, which was obtained from Taiwan's National Health Insurance Database. We developed a Cox proportional hazard regression model to estimate the effects of insomnia on T2DM risk. Kaplan‐Meier survival analysis was applied to compare the differences in the cumulative incidence of T2DM between the groups with and without insomnia.

During the follow‐up period, the T2DM incidence rate of patients with insomnia was significantly higher than that of patients without insomnia (34.7 vs 24.3 per 1000 person‐years). Overall, patients with insomnia had a higher risk of T2DM than did patients without insomnia (adjusted hazard ratio, 1.16; 95% confidence interval [CI], 1.10‐1.19). Among patients …