Fig. 2.

Endothelial function measurement by flow-mediated dilation upon train noise exposure. FMD was determined for control, Noise30 and Noise60 study nights. Exposure to both train noise patterns impaired endothelial function, although no difference was observed between Noise30 and Noise60 study nights. Data are mean ± SD of 69 (Noise30 and Noise60) or 70 (control) individual study nights in a randomized crossover fashion. p < 0.001. Box plots indicate minimum, maximum, 25% interquartile, median and 75% interquartile