Twenty-six patients with glycated hemoglobin A1c level of 7.4 % 0.6 % , fasting plasma glucose concentration of 141 22 mg/dL , postprandial plasma glucose ( PPG ) concentration of 264 48 mg/dL 1 h after the MTT , and diabetes duration of 3.0 3.1 years ( mean SD ) were included in the study .