KL and diabetes mellitus: Figure 4 showed the results on association between Klotho and eGFR in each subgroup with all covariates in Model III adjusted except the stratification factor itself. Significantly positive association was observed in all subgroups. Besides, interaction test was significant for all three factors (p < 0.001 for age, p = 0.008 for BMI, and p < 0.001 for diabetes).