Table 2 Sleep characteristics in adolescents with and without delayed sleep phase syndrome (DSPS) in the ung@hordaland study (n = 9,338)
No DSPS (n = 9032) | DSPS (n = 306) | |||||
|---|---|---|---|---|---|---|
Mean | SD | Mean | SD | P- level | Cohen’s d | |
Weekdays | ||||||
Bedtime | 23:17 | 00:59 | 23:46 | 01:04 | < .001 | 0.42 |
Risetime | 06:47 | 00:40 | 07:00 | 00:48 | < .001 | 0.30 |
Time in bed | 07:30 | 01:00 | 07:14 | 01:07 | < .001 | −0.20 |
Sleep duration | 06:27 | 01:38 | 05:41 | 01:21 | < .001 | −0.45 |
Sleep efficiency (%) | 84.8% | 18.21 | 78.0% | 13.2 | < .001 | −0.43 |
Oversleeping (“most days” or “always”) | 5.0% | 21.8 | 27.6% | 44.8 | < .001 | 0.64 |
Weekends | ||||||
Bedtime | 01:31 | 01:29 | 02:07 | 01:16 | < .001 | 0.35 |
Risetime | 11:13 | 01:31 | 12:09 | 01:17 | < .001 | 0.61 |
Time in bed | 09:41 | 01:23 | 10:01 | 01:06 | < .001 | 0.28 |
Sleep duration | 08:38 | 01:52 | 08:28 | 01:05 | .168 | −0.07 |
Week days/weekends | ||||||
Sleep onset latency | 00:47 | 00:57 | 01:21 | 00:50 | < .001 | 0.62 |
Wake after sleep onset | 00:14 | 00:38 | 00:11 | 00:23 | .130 | −0.16 |
Subjective sleep need | 08:34 | 01:52 | 09:09 | 01:58 | < .001 | 0.25 |
Sleep deficiency (weekdays) | 02:07 | 02:29 | 03:28 | 02:22 | < .001 | −0.48 |
Sleep deficiency (weekends) | 00:04 | 02:30 | −00:40 | 02:12 | < .001 | −0.25 |
Sleepiness (days per week) | 2.25 | 2.05 | 3.09 | 2.21 | < .001 | 0.39 |
Tiredness (days per week) | 3.68 | 1.86 | 4.87 | 1.80 | < .001 | 0.65 |
Differences between weekdays and weekends | ||||||
Bedtime | 02:27 | 02:17 | 02:21 | 00:59 | .434 | −0.09 |
Risetime | 04:26 | 01:36 | 05:28 | 01:23 | < .001 | 0.42 |
Sleep duration | 02:11 | 01:33 | 02:47 | 01:25 | < .001 | 0.38 |