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Figure 1 Plasma glucose levels and insulin levels during the OGTT. No significant differences were observed in fasting plasma glucose levels and plasma glucose levels at 1 and 2 h after the glucose load between troglitazone group and control group at baseline (top, left). However, plasma glucose levels at 1 and 2 h after the glucose load in troglitazone group were significantly smaller than those in control group at follow-up (top, right). No significant differences existed in fasting insulin levels and insulin levels at 1 and 2 h after the glucose load between two groups at baseline (bottom, left). However, fasting insulin levels and insulin levels at 1 and 2 h after the glucose load in troglitazone group were significantly smaller than were those in control group at follow-up (bottom, right). Closed circle = troglitazone group; open circle = control group. *p < 0.05 vs. control group.