Logistic regression models (Models A, B, and C) assessing the association of eGFR (mean: 119.23 ml/min/1.73m2) after adjusting for age, gender, smoking, BMI, diabetes duration and control, hypertension, dental visits in the entire population as well as using eGFR changes as predictor variable. Note that the OR for periodontitis increased with decreasing the mean eGFR by 1unit in Model A, 5units in Model B and 10 units in Model C.