Table 1.
Sample characteristics.
Fig 1.
Relative frequency of depression in boys and girls.
BDI-II scores > 13 indicate clinical levels of depression.
Table 2.
Proportion of adolescents in different sleep duration categories, N (%).
Fig 2.
Sleep duration in depressed and non-depressed adolescents.
A) Sleep duration on weekdays. B) Sleep duration on weekends. The bars display the percentage of adolescents in different categories of sleep duration. 8–10 hours is the recommended duration of sleep for this age group. * Proportions differ significantly from each other at the 0.05 level.
Fig 3.
Sleep quality in depressed and non-depressed adolescents.
Sleep quality index: range 1–6. The dashed line indicates the mean (non-depressed: 5.08, depressed: 4.04).
Fig 4.
Chronotype in depressed and non-depressed adolescents.
The dashed line indicates the mean midpoint of sleep on weekends, corrected for sleep debt (non-depressed: 4:36h, depressed: 5:03h).
Table 3.
Results of the logistic regression model.