Fig. 2
From: Does overnight duty affect vascular endothelial function?
Relationship between RHI and sleep duration or the degree of fatigue in 72 RH-PAT examinations. No significant association was observed between the reactive hyperemia index (RHI) and sleep duration (a) or CFQ scale (b) in 13 healthy subjects. However, a significant correlation was observed between the RHI and VAS scale (c). A linear regression line is shown (p < 0.05, considered significant)