Population characteristics
The initial characteristics of 64 OSA cases (AHI≄5 events/h) and 27 controls are presented in Table 1 . No significant changes were found between the OSA and control group in sex (all male) age and BMI. Individuals with OSA had more AHI and lower nighttime SpO2 (CT90 and L-SpO2) in PSG. As anticipated, RSI and RFS score of OSA patients were higher than the controls.