Figure 2From: Endothelium-derived markers and antioxidant status in the blood of obstructive sleep apnea males Comparison of plasma E-selectin concentration among patients with different stages of obstructive sleep apnea (OSA). Significant differences: P1 = 0.03, P2 = 0.0005, P3 = 0.015, and P4 = 0.04.Back to article page