Polysomnographic measures before and after surgery
| Before surgery | After surgery | p Value | |
|---|---|---|---|
| Values are mean (SD). | |||
| *p<0.05. | |||
| PLMS, periodic limb movement during sleep; REM, rapid eye movements; (+), total number of spindles per 20 minutes. | |||
| Changes of body position (n) | 0.9 (1.3) | 3.7 (3.6) | 0.04* |
| Time in bed (min) | 405.8 (120.2) | 447.1 (20.6) | 0.33 |
| Total sleep time (min) | 303.6 (64.0) | 253.4 (115.6) | 0.15 |
| Sleep efficiency (%) | 68.6 (12.6) | 62.5 (17.6) | 0.24 |
| Sleep onset latency (min) | 44 (59) | 21.4 (19.7) | 0.56 |
| Longest continuous sleep period (min) | 33.4 (15.5) | 51.3 (33.5) | 0.02* |
| Wake time after sleep onset (min) | 110.6 (54.6) | 98.8 (78.8) | 0.47 |
| Awakenings (n) | 17.6 (12) | 12.8 (10.5) | 0.05 |
| Arousal index | 18.0 (11.3) | 11.2 (12.4) | 0.02* |
| Stage I (%) | 10.1 (10.2) | 12.3 (11.7) | 0.42 |
| Stage II (%) | 54.9 (16.8) | 45.7 (18.8) | 0.07 |
| Stage III–IV (%) | 15.5 (9.6) | 22.2 (11.2) | 0.05 |
| REM (%) | 19.4 (9.8) | 19.6 (12.1) | 0.92 |
| Phasic REM submental density (%) | 38 (63.6) | 17.4 (15.6) | 0.54 |
| PLMS index | 6.8 (9.7) | 13.7 (16.5) | 0.20 |
| Spindles stage II (+) | 35.2 (30.0) | 31.1 (24.0) | 0.23 |
| Spindles stage III–IV (+) | 16.0 (14.0) | 22.2 (30.3) | 0.62 |
| Apnoea–hypopnoea index | 4.2 (3.9) | 4.8 (4.3) | 0.81 |