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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