ABCA1 and obstructive sleep apnea syndrome: Similarly, non-ABCA1 CEC represented a lower level in OSA patients (89.5 ± 10.2) compared to the control group (100 ± 11.6, P < 0.001, Fig. 2b)) and adjustment for age, sex, BMI, and HOMA-IR had no impact on the difference between the groups (99.7 ± 11.1 vs. 89.6 ± 6.3, P < 0.001), however, OSA categories showed no significant change.