Chinese | High CCT (n = 271) | Low CCT (n = 56) | P value |
---|---|---|---|
Sleep habits (school days) | |||
 Bed time Bedtime | 23:58 (0:43) | 00:01 (0:46) | 0.790 |
 Sleep latency (min) | 16.1 (10.4) | 16.2 (16.9) | 0.891 |
 Sleep onset time | 00:14 (0:45) | 00:17 (0:48) | 0.770 |
 Wake time | 07:41 (0:48) | 07:45 (0:55) | 0.442 |
 Midpoint of sleep | 03:58 (0:38) | 04:01 (0:43) | 0.510 |
 Sleep period time (h) | 7.45 (0.88) | 7.48 (0.92) | 0.645 |
Sleep habits (free days) | |||
  Bedtime | 00:23 (0:50) | 00:22 (0:58) | 0.803 |
 Sleep latency (min) | 14.7 (10.3) | 15.7 (16.9) | 0.561 |
 Sleep onset time | 00:38 (0:51) | 00:37 (0:57) | 0.909 |
 Wake time | 08:48 (1:02) | 08:42 (0:59) | 0.508 |
 Midpoint of sleep | 04:43 (0:49) | 04:40 (0:53) | 0.633 |
 Sleep period time (h) | 8.16 (0.99) | 8.08 (0.75) | 0.544 |
Social jet lag (h) | 0.79 (0.54) | 0.75 (0.67) | 0.153 |