Table 1.
Demographics of 219 female and 207 male high school students attending the first three school years (data from the Munich ChronoType Questionnaire).
| Outcome measure | Average (±SD) | Range |
|---|---|---|
| Age (years) | 13.06 (0.95) | 11–16 |
| Chronotype (MSFsc, h:min) | 4:16 (65′) | 23:37–8:23 |
| Social Jetlag (h:min) | 2:13 (59′) | 0–5:56 |
| Sleep onset on school days (h:min) | 22:37 (59′) | 20:35–4:00 |
| Sleep end on school days (h:min) | 6:38 (25′) | 4:30–8:15 |
| Sleep duration on school days (h:min) | 8:01 (63′) | 3:15–10:40 |
| Sleep onset on school-free days (h:min) | 0:05 (81′) | 21:10–5:15 |
| Sleep end on school-free days (h:min) | 9:32 (88′) | 2:00–14:00 |
| Sleep duration on school-free days (h:min) | 9:26 (88′) | 1:30–12:40 |
Data concerning chronotype, sleep onset and sleep end refer to external clock time and are reported in clock hours.