Table 2.
Polysomnographic data (means ± standard deviations)
| First Night: | PI patients | Healthy controls | t | P |
|---|---|---|---|---|
| First Night | ||||
| Total sleep time (min) | 351.9 ± 60.0 | 380.9 ± 48.8 | −2.03 | 0.047 |
| Sleep efficiency (%) | 73.3 ± 12.3 | 79.4 ± 10.1 | −2.05 | 0.045 |
| Sleep onset latency (min) | 28.7 ± 18.3 | 21.7 ± 19.9 | 1.36 | 0.180 |
| Wake after sleep onset (min) | 87.8 ± 47.6 | 69.5 ± 39.8 | 1.59 | 0.118 |
| Number of awakenings | 32.2 ± 16.4 | 40.3 ± 15.0 | −1.95 | 0.057 |
| Arousal index/TST (h‐1) | 19.7 ± 7.1 | 20.8 ± 7.8 | −0.54 | 0.591 |
| Sleep apnea index/TST (h‐1) | 0.3 ± 0.8 | 0.4 ± 0.5 | −0.26 | 0.793 |
| PLMS arousal index/TST (h‐1) | 0.3 ± 0.6 | 0.4 ± 0.8 | −0.58 | 0.566 |
| Stage 1 (% SPT) | 10.4 ± 5.2 | 11.4 ± 4.9 | −0.75 | 0.454 |
| Stage 2 (% SPT) | 47.6 ± 9.7 | 49.1 ± 8.6 | −0.63 | 0.534 |
| SWS (% SPT) | 7.7 ± 7.8 | 7.0 ± 6.8 | 0.37 | 0.716 |
| REM (% SPT) | 14.3 ± 4.4 | 17.0 ± 5.2 | −2.03 | 0.047 |
| Second Night | ||||
| Total sleep time (min) | 387.4 ± 53.2 | 415.2 ± 24.6 | −2.71 | 0.009 |
| Sleep efficiency (%) | 80.7 ± 11.1 | 86.5 ± 5.1 | −2.70 | 0.009 |
| Sleep onset latency (min) | 16.6 ± 10.8 | 18.1 ± 17.1 | −0.39 | 0.695 |
| Wake after sleep onset (min) | 65.3 ± 45.3 | 42.1 ± 17.2 | 2.76 | 0.008 |
| Number of awakenings | 31.1 ± 11.9 | 36.5 ± 13.8 | −1.55 | 0.126 |
| Arousal index / TST (h‐1) | 16.9 ± 6.1 | 16.1 ± 6.5 | 0.49 | 0.629 |
| Stage 1 (% SPT) | 8.3 ± 4.0 | 9.1 ± 4.5 | −0.69 | 0.491 |
| Stage 2 (% SPT) | 50.9 ± 9.6 | 53.6 ± 5.8 | −1.37 | 0.177 |
| SWS (% SPT) | 9.5 ± 8.8 | 8.7 ± 7.4 | 0.38 | 0.704 |
| REM (% SPT) | 16.8 ± 6.4 | 19.4 ± 3.8 | −2.00 | 0.050 |