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Figure 1 Box plots (median and 25th to 75th interquartile range) of brachial artery endothelial function variables between subjects with and without vascular events. Peak flow-mediated dilation (FMD) and FMD/nitroglycerin-mediated dilation (NMD) ratio were significantly lower in subjects with events compared with subjects without events. There was no difference in NMD between subjects with and without events.