INS and obstructive sleep apnea syndrome: Compared to those with none-to-mild OSA, subjects with moderate-to-severe OSA were older (41.20 vs. 38.84 years, p < 0.001) and had higher BMI (27.05 vs. 24.10 kg/m2, p < 0.001), systolic blood pressure (SBP) (125.66 vs. 120.41 mmHg, p < 0.001), and diastolic blood pressure (DBP) (80.88 vs. 77.12, p < 0.001) values, as well as higher glucose (5.45 vs. 5.05 mmol/L, p < 0.001), insulin (13.33 vs. 9.01 μU/mL, p < 0.001), TC (4.86 vs. 4.50 mmol/L, p < 0.001), TG (2.11 vs. 1.42 mmol/L, p < 0.001), and LDL (3.08 vs. 2.78 mmol/L, p < 0.001) levels.