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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.