Table 4. Results of univariate and multivariate linear regression analyses.
| Univariate | Multivariate stepwise regression | |||
|---|---|---|---|---|
| r | p | β | p | |
| Age, years | -0.178 | 0.242 | -0.165 | 0.249 |
| BMI, kg/m2 | -0.368 | 0.013 | -0.368 | 0.013 |
| Neck circumference, cm | -0.064 | 0.677 | ||
| OA compliance, % | 0.128 | 0.403 | ||
| OA use, h/day | 0.138 | 0.367 | ||
| Polysomnography | ||||
| TST, minutes | -0.062 | 0.686 | ||
| N1 sleep, % | 0.069 | 0.651 | ||
| N2 sleep, % | -0.112 | 0.464 | ||
| N3 sleep, % | 0.161 | 0.292 | -0.135 | 0.393 |
| REM sleep, % | -0.265 | 0.079 | ||
| WASO | -0.018 | 0.907 | ||
| Sleep efficacy | -0.018 | 0.906 | ||
| Arousal index | 0.273 | 0.070 | 0.166 | 0.275 |
| Sleep latency | 0.131 | 0.389 | ||
| REM sleep latency | 0.050 | 0.745 | ||
| AHI | 0.017 | 0.909 | ||
| AI | 0.336 | 0.024 | 0.220 | 0.160 |
| HI | -0.259 | 0.085 | -0.108 | 0.511 |
| Hypopnea, % | -0.249 | 0.099 | -0.106 | 0.510 |
| Min sat, % | 0.125 | 0.414 | ||
AHI: apnea-hypopnea index, AI: apnea index, BMI: body mass index, HI: hypopnea index, Min sat: minimum oxygen saturation, OA: oral appliance, TST: total sleep time, WASO: wake after sleep onset.