Table 2. Serum S1P level and its correlations with various parameters of vascular function.

	Spearman’s R coefficient	p-value
LnRHI	−0.221	0.046
ASP	0.214	0.049
DBP	0.204	0.066
SBP	0.107	0.337
Average IMT	−0.044	0.696
PWV	−0.038	0.733
AIx	0.017	0.882

RHI = Reactive Hyperemia Index, AIx = Augmentation Index, ASP = Aortic Systolic Pressure, S1P = sphingosine-1-phosphate, IMT = intima-media thickness, PWV = pulse wave velocity.