Figure 4

Changes of HbA1c levels among the patient subgroups divided according to therapeutic methods prior to the initiation of metformin in the non-obese (left) and obese (right) patients with type 2 diabetes mellitus. Data represent the mean ± SD. Closed circles, closed squares and open squares represent the diet, oral hypoglycemic agents (OHAs) and insulin therapies, respectively. * P < 0.05 and ** P < 0.01 among three treatment groups.