Polysomnographic data of the study participants
| Group; mean ± SD | ||||
|---|---|---|---|---|
| Result | PI | Control | Statistic | p value |
| Total sleep time, min | 399.7 ± 32.1 | 422.7 ± 19.0 | t38 = −2.68 | 0.011 |
| Sleep efficiency, % | 83.4 ± 6.7 | 87.8 ± 3.9 | t38 = −2.42 | 0.021 |
| Sleep-onset latency, min | 17.9 ± 14.8 | 13.3 ± 7.9 | t38 = 1.20 | 0.24 |
| Wake after sleep onset, min | 49.1 ± 24.6 | 43.4 ± 17.2 | t38 = 0.83 | 0.41 |
| Arousal index/TST, h−1 | 15.9 ± 8.1 | 13.8 ± 4.6 | t38 = 0.96 | 0.34 |
| Stage N1, % SPT | 8.4 ± 3.9 | 7.9 ± 4.1 | t38 = 0.38 | 0.70 |
| Stage N1, min | 38.3 ± 18.9 | 36.8 ± 19.1 | t38 = 0.21 | 0.83 |
| Stage N2, % SPT | 55.1 ± 7.3 | 53.7 ± 6.3 | t38 = 0.65 | 0.52 |
| Stage N2, min | 246.7 ± 30.8 | 249.9 ± 27.4 | t38 = −0.35 | 0.73 |
| Stage N3, % SPT | 6.0 ± 6.0 | 10.2 ± 6.4 | t38 = −2.10 | 0.043 |
| Stage N3, min | 26.9 ± 27.3 | 47.9 ± 30.3 | t38 = −2.24 | 0.031 |
| Stage R, % SPT | 19.5 ± 4.9 | 18.9 ± 4.2 | t38 = 0.43 | 0.67 |
| Stage R, min | 87.7 ± 23.4 | 88.0 ± 19.7 | t38 = −0.06 | 0.96 |
PI = primary insomnia; SD = standard deviation; SPT = sleep period time; TST = total sleep time.