Trends in prevalence and incidence of diabetes mellitus from 2005 to 2014 in Taiwan

Abstract

Background/purpose: Diabetes mellitus (DM) and DM-related complications place a high socioeconomic burden on individuals and society. Updating nationwide information periodically is thus pivotal to preventing DM and improving its management in Taiwan.

Methods: We used the National Health Insurance Research Database; disease diagnosis codes were assigned according to the International Classification of Diseases, 9th Revision, Clinical Modification. DM was defined as ≥3 outpatient visits or 1 hospitalization within a year. We excluded individuals with gestational DM, those with missing data, and those aged >100 years. Type 1 DM (T1DM) was defined based on information from the catastrophic illness registry.

Results: From 2005 to 2014, total population with DM increased by 66% and age-standardized prevalence in patients aged 20-79 years increased by 41%. The DM prevalence was generally higher in men; however, the prevalence was higher in women aged ≥65 years. The prevalence of DM was approximately 50% in those aged >80 years. DM incidence increased by 19%; the increase was most obvious in patients aged 20-39 years (p < 0.001). The standardized incidence of T1DM slightly decreased by 11% (p = 0.118) and standardized prevalence of T1DM increased from 0.04% to 0.05%. Number of T1DM accounted for 0.51-0.59% of the entire diabetic population during the observation period.

Conclusion: DM prevalence is continually increasing, but the incidence only marginally increased from 2005 to 2014. Moreover, DM is a major problem in elderly people. The higher incidence of DM in men is consistent with the pandemic of overweight and obesity in men in Taiwan.

Keywords: Diabetes mellitus; Incidence; Prevalence.