Risk of Developing Type 2 Diabetes in Individuals With a Psychiatric Disorder: A Nationwide Register-Based Cohort Study
RESEARCH DESIGN AND METHODS We analyzed data from 5,005,612 adults living in Denmark between 1995 and 2018, without prior diabetes. We investigated 10 different categories of psychiatric disorders, and a composite group with any psychiatric disorder. Individuals with a psychiatric disorder were compared to individuals without, using multivariable-adjusted Poisson regression to estimate incidence rate ratios (IRR) of type 2 diabetes. We modeled age-specific incidence rates (IR) for individuals with and without the specific psychiatric disorder. All models were stratified by sex.
RESULTS In total, 334,739 individuals developed type 2 diabetes during follow-up. For all investigated categories of psychiatric disorders, we found increased IR of type 2 diabetes for individuals with versus those without a psychiatric disorder (IRR: men: 1.47 (95% CI:1.45-1.50), women: 1.65 (95% CI: 1.62-1.68)). When we examined age-specific IR, the largest differences were found in the younger population (<50 years).
CONCLUSIONS We found that the IR of type 2 diabetes was higher in individuals with a psychiatric disorder compared to individuals without a psychiatric disorder and particularly high in the younger people with a psychiatric disorder. New studies into the prevention and early detection of type 2 diabetes in these groups are warranted.