Linear regression model for mean heart rate (HR), mean RR interval, high-frequency (HF) bands and low/high-frequency (LF/HF) band ratio

Mean HR
Mean RR
SpO2 nadir0.060.260.4
HF bands
 Mean SpO2#
SpO2 nadir#
LF/HF band ratio
 Mean SpO2#−
SpO2 nadir#−
  • HR: heart rate; oAHI: obstructive apnoea–hypopnoea index; RDI: respiratory disturbance index; SpO2: arterial oxygen saturation measured by pulse oximetry; ODI: oxygen desaturation index. Due to multicollinearity, the sleep-related respiratory parameters could not be fitted in a single regression model. Therefore, each r2-value represents a separate regression model with the sleep-related respiratory parameter as an independent variable, controlling for age and waist circumference. #: significant contributors for the model (p≤0.05).