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Table 3 Sleep habits on school days and free days in university students in China

From: Is the use of high correlated color temperature light at night related to delay of sleep timing in university students? A cross-country study in Japan and China

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
  1. Values are means and SD
  2. Adjusted by age and sex