Table II.
Comparison of sleep status and health related quality of life between Morning and Evening type.
| Morning type (n = 69) | Evening type (n = 57) | p - value | |
|---|---|---|---|
| Sleep variables | |||
| Sleep onset time (h:mm)a) | 0:00 (23:30 – 0:10) | 0:15 (0:00 – 1:00) | 0.019* |
| Sleep offset time (h:mm)a) | 6:00 (5:30 – 6:30) | 6:45 (6:20 – 7:00) | < 0.001** |
| Total sleep time (h)a) | 6.5 (5.5 – 6.8) | 6.5 (6.0 – 7.0) | 0.135 |
| PSQI-J (scores)a) | 4.0 (3.0 – 6.0) | 6.0 (4.0 – 7.0) | 0.038* |
| SF-36v2 | |||
| PCS (scores)c) | 57.1 ± 6.4 | 57.6 ± 6.1 | 0.668 |
| MCS (scores)a) | 49.1 (45.5 – 54.1) | 49.6 (42.7 – 52.8) | 0.654 |
| RCS (scores)a) | 51.8 (45.6 – 56.6) | 48.3 (37.4 – 55.0) | 0.043* |
All values expressed as mean ± SD or median (25 – 75 percentile). * p < 0.05 and ** p < 0.01 by using Mann-Whitney U testa) and two sample t-testc). PSQI-J, the Japanese version of the Pittsburg Sleep Quality Index; SF-36v2, the Japanese MOS Short-Form 36-Item Health Survey ver2; PCS, Physical component score; MCS, Mental component score; RCS, Role-social component score