Global and Chinese burden of chronic kidney disease due to type 2 diabetes and associated risk factors from 1990 to 2021

Objective To assess the burden of chronic kidney disease (CKD) caused by type 2 diabetes (T2D) (CKD-T2D) among populations of different ages, genders, regions, and socio-demographic index (SDI) levels globally and in China from 1990 to 2021. Methods Based on data from the 2021 Global Burden of Disease Study (GBD), incidence, prevalence, mortality, and disability-adjusted life years (DALYs) of CKD-T2D in 204 countries and regions were analyzed, with absolute numbers and their 95% uncertainty intervals (UIs) calculated. Results From 1990 to 2021, the global burden of CKD-T2D increased significantly. In 2021, there were 2 012 024 (95%UI: 1 857 800-2 154 288) new cases, marking a 167.2% (95%UI: 153.5%-182.6%) increase from 1990. The age-standardized incidence rate (ASIR) reached 23.07 per 100 000 (95%UI: 21.40-24.72), an increase of 21.0% (15.0%-27.5%) since 1990. Regional analysis showed that North Africa and the Middle East had the highest ASIR (42.802 per 100 000). Compared to 1990, China's CKD-T2D incidence rose significantly to 354,157 cases (95%UI: 321 265-382 784), with crude incidence increasing by 177.6% (95%UI: 154.8%- 205.5%) and ASIR rising slightly by 7.8% [95%UI: (-0.1%) to 17.8%]. For other indicators, crude rates increased whereas age-standardized rates declined. In 2021, CKD-T2D incidence was highest among people aged 65-74 worldwide [364 163 new cases in ages 65-69 (95%UI: 272 571-475 468) and 366 045 in ages 70-74 (95%UI: 286 728-459 891)], with males bearing a higher burden than females [65-69: males 187 097 (95%UI: 140 064-243 571), females 177 066 (95%UI: 132 338-231 769); 70-74: males 187 216 (95%UI: 146 377-234 997), females 178 830 (95%UI: 140 938-224 801)]. SDI stratification indicated that from 1990 to 2021, high-SDI regions had the highest ASIR with a continuous upward trend, while low-SDI regions had the highest mortality rates with limited improvement. Hyperglycemia, obesity, high-calorie diets, and hypertension were the main risk factors for CKD-T2D. Conclusion CKD-T2D remains a major public health issue, with a particularly high disease burden among elderly males and in low- and middle-income countries. While crude rates have risen in China, age-standardized mortality rate (ASMR) and DALYs have declined.