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Figure 1 Effects of oral glucose loading on the flow-mediated dilation (FMD) of the brachial artery. There was a significant difference in FMD among the three groups (p < 0.01, by ANOVA). DM: diabetes mellitus; IGT: impaired glucose tolerance; NGT: normal glucose tolerance. Data are expressed as mean ± SE. *p < 0.01, versus fasting; **p < 0.005, versus fasting; p < 0.01, versus 1 h.