Table 3 Descriptive characteristics focus group sample

Mean age (± SD)

14.8 (± 1.0) years

Sex (%)

26 (36.1%) boys

Education (%)

24 (33.3%) vocational

24 (33.3%) technical

24 (33.3%) general

Mean score sASWS* (0–60) (± SD)

39.5 (± 7.6)

Mean score PDSS** (0–32) (± SD)

13.5 (± 4.6)

Week days

Weekend days

Mean sleep duration (± SD)

7h 50m (± 1h 10m)

9h 45m (± 1h 17m)

Mean time trying to fall asleep (± SD)

22h 27m (± 1h 2m)

23h 52m (± 1h 28m)

Mean sleep latency (± SD)

28m (± 24m)

24m (± 30m)

Mean wake time (± SD)

6h 49m (± 25m)

10h 13m (± 27m)