Effect Modification of Hyperuricemia, Cardiovascular Risk, and Age on Chronic Kidney Disease in China: A Cross-Sectional Study Based on the China Health and Nutrition Survey Cohort

IntroductionThe question of whether the increased burden of chronic kidney disease (CKD) is caused by the interaction of hyperuricemia and cardiovascular disease (CVD) risk factors or is accelerated by aging remains unresolved. The purpose of this study is to better understand the effect modification of hyperuricemia, cardiovascular risk, and age on CKD among the Chinese population. MethodsThis cross-sectional study of 8243 participants was derived from the China Health and Nutrition Survey (CHNS) in 2009. Inclusion criteria included age >= 18 years, non-pregnancy, and no history of high-protein diet prior to blood test. Demographics, comorbidities, health-related behaviors, and serum biomarkers were collected. Interaction association of hyperuricemia, CVD risk and age with CKD were analyzed using Logistic regression. ResultsCKD was detected in 359 (27.2%, 95% CI 24.8 similar to 29.7%) of 1321 participants with hyperuricemia and 680 (9.8%, 95% CI 9.1 similar to 10.5%) of 6,922 participants without hyperuricemia, and these patterns remained significant after controlling for age, gender, and Framingham risk score (adjusted odds ratio [aOR] 3.82, 95% CI 3.20 similar to 4.57). We found a negative multiplicative interaction between hyperuricemia and CVD risk on CKD. The aOR in low-CVD risk groups was 5.51 (95% CI 4.03 similar to 7.52), followed by medium-CVD risk groups (aOR: 3.64, 95% CI 2.61 similar to 5.09) and high-CVD risk groups (aOR: 2.89, 95% CI 2.12 similar to 3.96). CVD risk was less associated with CKD in hyperuricemia group (aOR: 0.92, 95% CI 0.68 similar to 1.22) than in non-hyperuricemia group (aOR: 1.43, 95% CI 1.21 similar to 1.70). Furthermore, hyperuricemia and age had a significant additive effect on CKD, with a synergy index of 2.26 (95% CI 1.45 similar to 3.52). Coexisting with older age and hyperuricemia, the likelihood of developing CKD was higher than the sum of the two alone. ConclusionThe link between hyperuricemia and CKD begins at a young age and becomes stronger in the low CVD risk group. For young adults, early detection of hyperuricemia, routine CVD risk assessment, and timely intervention of modifiable factors are warranted.