Table 1 Demographical and clinical 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 | |
Age, mean | 17.8 | (0.8) | 18.0 | (0.8) | .006 | 0.25 |
Girls, % | 96.3% | 3.7% | .007 | |||
Boys, % | 97.3% | 2.7% | ||||
Vocational situation, % | .153 | |||||
In school | 98.1% | 99.3% | ||||
Trainee | 1.3% | 0.0% | ||||
Not in school | 0.7% | 0.7% | ||||
Maternal education, % | .119 | |||||
University/College | 48.7% | 51.4% | ||||
High school | 41.4% | 35.7% | ||||
Primary school | 9.9% | 12.9% | ||||
Paternal education, % | < .001 | |||||
University/college | 43.1% | 51.1% | ||||
High school | 46.7% | 33.5% | ||||
Primary school | 10.3% | 15.5% | ||||
Parents live together, % | < .001 | |||||
No | 32.0% | 46.3% | ||||
Family economy | .006 | |||||
Approx. like most others | 67.8% | 61.1% | ||||
Better economy | 25.2% | 27.7% | ||||
Poorer economy | 6.9% | 11.2% | ||||
Current smoker | 31.9% | 35.9% | .225 | |||
Ever tried alcohol | 73.6% | 87.6% | < .001 | |||
Body mass index | 22.2 | 3.6 | 22.2 | 3.5 | .818 | 0.00 |
Insomnia, % | 12.3% | (32.8) | 55.9% | (49.7) | < .001 | 1.04 |
Depression (total SMFQ score) | 5.7 | (5.7) | 8.8 | (5.9) | < .001 | 0.53 |
Non-attendance, mean | ||||||
Self-reported days* | 1.4 | (2.4) | 2.3 | (2.6) | < .001 | 0.36 |
Self-reported hours* | 2.1 | (3.2) | 3.7 | (3.9) | < .001 | 0.45 |
Number of days$ | 3.9 | (4.9) | 7.1 | (6.0) | < .001 | 0.58 |
Number of hours$ | 7.2 | (10.8) | 15.4 | (14.5) | < .001 | 0.64 |