MPO and obstructive sleep apnea syndrome: There were no significant differences between OSA patients with EDS versus without EDS (115.9 (75.4–194.0) vs. 117.6 (68.4–186.2) ng/mL for MPO, and 270.4 (188.5–387.1) vs. 261.6 (190.8–362.0) ng/mL for MMP-9, respectively).