CST3 and diabetes mellitus: In another analysis of US participants aged 18 years or older in the NHANES III, Astor et al29 found that the association between eGFR based on both creatinine and cystatin C was a weak predictive marker when compared to cystatin C. The reasons for the differences in previous findings and ours might be differences in age, racial/ethnic groups, or other participant characteristics, and future studies, especially those that distinguish between individuals with and without diabetes, are still required to confirm our results.