Table 2.
Polysomnographic data in PLMS and non-PLMS groups
| Total N = 314 | PLMS N = 17 | Non-PLMS N = 297 | P | |
|---|---|---|---|---|
| Total sleep time, min | 472.0 ± 58.5 | 459.3 ± 73.5 | 472.7 ± 57.6 | 0.36 |
| Sleep efficiency, % | 82.2 ± 10.1 | 80.8 ± 12.7 | 82.3 ± 9.9 | 0.54 |
| REM sleep latency, min | 133.8 ± 55.4 | 145.3 ± 70.9 | 133.1 ± 54.4 | 0.39 |
| Sleep onset latency, min | 23.7 ± 20.0 | 27.2 ± 27.1 | 23.5 ± 19.6 | 0.46 |
| Stage R, % | 21.1 ± 3.8 | 19.8 ± 4.3 | 21.2 ± 3.8 | 0.14 |
| Stage N1, % | 7.1 ± 3.1 | 7.5 ± 3.3 | 7.1 ± 3.1 | 0.62 |
| Stage N2, % | 48.7 ± 5.6 | 47.9 ± 6.1 | 48.7 ± 5.5 | 0.57 |
| Slow wave sleep, % | 23.1 ± 5.3 | 24.8 ± 6.7 | 23.0 ± 5.2 | 0.17 |
| Apnea hypopnea index, /h | 1.3 ± 1.1 | 1.3 ± 1.2 | 1.3 ± 1.1 | 0.38 |
| OAHI ≥ 1, N (%) | 106 (33.8) | 5 (29.4) | 101 (34.0) | 0.70 |
| AHI ≥ 1, N (%) | 159 (50.6) | 7 (41.2) | 152 (51.2) | 0.42 |
| Oxygen desaturation index, /h | 0.42 ± 0.73 | 0.46 ± 0.45 | 0.42 ± 0.75 | 0.85 |
| Lowest SpO2 during REM | 93.2 (2.0) | 92.2 (2.6) | 93.3 (1.9) | 0.10 |
| Lowest SpO2 during NREM | 93.0 (2.3) | 92.8 (1.9) | 93.0 (2.4) | 0.70 |
| PLMI* | 0.8 ± 2.3 | 8.9 ± 4.0 | 0.4 ± 0.9 | < 0.001 |
| Arousal index, /h* | 6.6 ± 2.6 | 9.4 ± 3.5 | 6.4 ± 2.5 | < 0.001 |
| PLMSArI* | 0.3 ± 0.8 | 2.2 ± 1.9 | 0.2 ± 0.5 | < 0.001 |
Definition of abbreviations: PLMI, periodic limb movement index; PLMSArI, periodic limb movements related arousal index; PLMS, periodic limb movement during sleep;
*
P < 0.05