Association between SDB parameters and postural stability outcomes
| Beta coefficient (±95% CI) | Rpartial | p Value | |
|---|---|---|---|
| LFS | |||
| AHI | 0.0049 (0.001 to 0.009) | 0.22 | 0.009 |
| ODI 3% | 0.0043 (0.001 to 0.008) | 0.21 | 0.013 |
| Mean SpO2 | −0.0578 (−0.087 to −0.029) | −0.32 | <0.001 |
| SpO2 <90 | 0.0051 (0.001 to 0.009) | 0.22 | 0.010 |
| Mean speed | |||
| AHI | 0.0501 (0.010 to 0.089 | 0.25 | 0.014 |
| ODI 3% | 0.0424 (0.006 to 0.078) | 0.19 | 0.024 |
| Mean SpO2 | −0.6332 (0.016 to 0.099) | −0.32 | <0.001 |
| SpO2 <90 | 0.0579 (0.016 to 0.099) | 0.22 | 0.007 |
| XY length | |||
| AHI | 2.5755 (0.550 to 4.600) | 0.21 | 0.014 |
| ODI 3% | 2.1822 (0.326 to 4.038) | 0.27 | 0.023 |
| Mean SpO2 | −32.459 (−48.50 to −16.41) | −0.33 | <0.001 |
| SpO2 <90 | 2.9677 (0.833 to 5.102) | 0.23 | 0.007 |
Multiple regression model adjusted for age, BMI and sleepiness (Epworth score) (n=138).
Rpartial represents the coefficient of correlation (of the variable with the dependent variable), adjusted for the effect of the other variables in the model.
Length XY: total displacement of CoP in anteroposterior (Y axis) and mediolateral (X axis) plan (length in mm); LFS: length of the CoP displacement as a function of the surface of CoP trajectory; mean speed: mean speed of CoP displacement (mm/s).
AHI, apnoea–hypopnoea index; BMI, body mass index; CoP, centre of pressure; ODI, oxygen desaturation index; SDB, sleep-disordered breathing; SpO2 <90%, % of the night spent with and SpO2 <90%.