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Figure 1 Flow-mediated endothelium-dependent dilation (FMD) and nitroglycerin-induced dilation (NTG) in control and passive smoking subjects (PS). The FMD in the passive smokers was significantly lower (p < 0.0001) than in the controls, but NTG responses of the two groups were similar (p = 0.2). In each box plot, the bottom and top of the box represent the 25th percentile and the 75th percentile, respectively. The line across each box represents the median value, and the vertical lines encompass the entire range of values for each group of the participants.
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