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Table 2 Morningness-Eveningness Questionnaire (MEQ) score and sleep habits of each genotype group

From: Association between the melanopsin gene polymorphism OPN4*Ile394Thr and sleep/wake timing in Japanese university students

Genotype

TT (n = 223)

TC (n = 91)

CC (n = 14)

MEQ score

48.4 ± 7.4

48.6 ± 7.3

44.8 ± 6.6

Weekdays

   

Bedtime

1:03 ± 0:59

0:58 ± 1:14

1:52 ± 1:36

Wake time

7:49 ± 1:28

7:44 ± 1:20

8:59 ± 1:35

Mid-sleep

4:26 ± 1:06

8:17 ± 1:07

5:26 ± 1:29

Sleep duration

6:16 ± 1:02

6:25 ± 1:15

6:58 ± 1:20

Weekends

   

Bedtime

1:31 ± 1:21

1:26 ± 1:15

2:35 ± 1:31

Wake time

9:44 ± 1:47

9:26 ± 1:38

10:23 ± 2:00

Mid-sleep

5:37 ± 1:24

5:26 ± 1:17

6:29 ± 1:41

Sleep duration

8:08 ± 1:26

8:03 ± 1:41

7:45 ± 1:27

Values indicate means ± SD.