HYAL1 and obstructive sleep apnea syndrome: Plasma HYAL-1 concentrations were significantly higher (0.59/0.31–0.88/ng/mL vs. 0.31/0.31–0.58/ng/mL; p = 0.005, Fig. 1) and HMW-HA levels were lower (31.63/18.11–59.25/ng/mL vs. 46.83/25.41–89.95/ng/mL; p = 0.068, Fig. 2) in the OSA group compared to the controls after adjustment for age, gender, BMI and smoking.