Table 1 Characteristics of subjects in each group
From: Intake of l-serine before bedtime prevents the delay of the circadian phase in real life
| Â | Placebo | l-serine | p value |
|---|---|---|---|
(n = 17) | (n = 16) | ||
Mean age [years] | 22.1 ± 2.5 | 21.3 ± 1.9 | p = 0.30 |
Sex | 13M 4F | 10M 6F | p = 0.42 |
MEQ score | 48.1 ± 7.3 | 47.4 ± 8.5 | p = 0.82 |
Sleep habits (school days) | |||
 Bedtime | 0:56 ± 0:53 | 0:36 ± 0:51 | p = 0.29 |
 Sleep latency [min] | 16.9 ± 11.6 | 15.3 ± 8.5 | p = 0.65 |
 Sleep onset time | 1:13 ± 0:58 | 0:51 ± 0:51 | p = 0.27 |
 Wake time | 8:12 ± 0:54 | 8:01 ± 1:04 | p = 0.59 |
 Midpoint of sleep | 4:42 ± 0:51 | 4:26 ± 0:50 | p = 0.36 |
 Sleep period time [h] | 7.00 ± 0.77 | 7.16 ± 0.98 | p = 0.60 |
Sleep habits (free days) | |||
 Bedtime | 1:18 ± 1:12 | 1:23 ± 0:47 | p = 0.83 |
 Sleep latency [min] | 17.2 ± 12.2 | 15.3 ± 8.5 | p = 0.60 |
 Sleep onset time | 1:35 ± 1:18 | 1:38 ± 0:50 | p = 0.91 |
 Wake time | 9:11 ± 1:24 | 9:03 ± 0:55 | p = 0.74 |
 Midpoint of sleep | 5:23 ± 1:17 | 5:20 ± 0:47 | p = 0.90 |
 Sleep period time [h] | 7.59 ± 0.83 | 7.41 ± 0.82 | p = 0.54 |
Social jetlag [h] | 0.68 ± 0.68 | 0.90 ± 0.75 | p = 0.37 |