Matrix of the interaction term in pairs between metabolic parameters. The color refers the mean of the log hazard ratio of type 2 diabetes mellitus (DM) of the statistically significant interaction term between predictors in pairs for nondiabetic (upper left triangle) and normal glucose tolerance participants (lower right triangle). Model adjusted for age, sex, body mass index (BMI), drinking and smoking status, physical exercise, family history of DM, history of dyslipidemia medication, and hypertension at baseline (third visit). b, measurement at third visit considered baseline value; IR, homeostasis model assessment of insulin resistance; m, average of first 3 visits; MI, Matsuda index; v, average real variability of first 3 visits. For other abbreviations see Table 1.