Table 3.
AHI values for the supine and lateral postures during REM and NREM sleep in the three groups*
| Entire group, N = 100 | REM | NREM |
|---|---|---|
| Supine | 54.2 ± 20.7 | 37.6 ± 27.3 |
| Lateral | 22.8 ± 23.2 | 13.2 ± 21.4 |
| REM-related, N = 45 | ||
| Supine | 50.0 ± 20.7 | 22.0 ± 18.6 |
| Lateral | 23.1 ± 20.6 | 8.0 ± 9.8 |
| Not–REM-related, N = 55 | ||
| Supine | 57.6 ± 20.2 | 50.4 ± 26.8 |
| Lateral | 22.4 ± 25.3 | 17.4 ± 26.8 |
*
ANOVA with main factor of Group (REM-related vs. Not–REM-related) and repeated-measures factors of body posture (supine vs. lateral) and sleep stages (REM vs. NREM) yielded significant effects of sleep stage (F1,98 = 100.771, p < 0.001) and posture (F1,98 = 194.899, p < 0.001). It also revealed significant interactions of sleep stage × Group (F1,98 = 31.321, p < 0.001), posture × Group (F1,98 = 12.139, p < 0.005), and sleep stage × posture (F1,98 = 6.533, p < 0.05). A significant main effect of the Group factor was demonstrated as well (F1,98 = 333.937, p < 0.005).