Trends In Prevalence And Incidence Of Type 2 Diabetes Among Adults In Beijing, China, From 2008 To 2017

Aims: To describe secular trends in diagnosed type 2 diabetes prevalence and incidence in Beijing, China.Methods: Using health insurance claims for 17.7 million adults >= 20 years in 2008-2017, we identified people with diabetes using hospital diagnoses and drug prescriptions. Results were age-standardised using data for Beijing from China's 2010 census. Trends in prevalence and incidence were analysed using Joinpoint regression analysis.Results: From 2008 to 2017, we identified 2,104,159 people diagnosed with type 2 diabetes. Type 2 diabetes prevalence increased from 3.7% [95% CI: (3.6, 3.8)] to 6.6% (6.4, 6.7), but the annual rate of increase slowed from 18.1% (14.4, 22.0) to 1.5% (0.8, 2.2) before and after 2011 respectively. Women had a higher diabetes prevalence than men, for all years. The yearly increase in prevalence was greater in people younger than 40 years, with an average annual percentage change of 13.6% (10.7, 16.5) compared to 6.5% (5.6, 7.4) in those over 40 years. Over the 10 years, the overall incidence decreased from 24.3 (24.2, 24.4) to 11.5 (11.5, 11.6) per 1000 person-years, but it increased in people younger than 40 years. The average age at diabetes diagnosis dropped from 62 to 56 years (p < 0.001). Among incident cases of diabetes, the percentage of people under 40 years increased from 3.0% to 10.9% (p < 0.001).Conclusions: The prevalence of diagnosed type 2 diabetes in Beijing increased continuously over the 10 years, the incidence decreased, except in people under 40 years. Continuous efforts are needed to prevent diabetes in China.