Figure 6. The effect of energy reduction and calcium supplementation on HbA1c adjusted for age, gender, smoking, drinking, regular exercise, and BMI. (A) Comparison of HbA1c changes between ERGs and NERGs. (B) Comparison of HbA1c changes between CSGs and NCSGs. (C) Comparison of HbA1c changes among CG, ERG, CSG, and ER-CSG. Note: P-value for the difference in the joint effect of intervention and time.