Table 2 Baseline characteristics in the intervention and control groups
Characteristics | Intervention group (n = 1,349) | Control group (n = 1,338) | Difference between groups |
|---|---|---|---|
Age (years) | |||
Median (range) | 19 (17–21) | 19 (17–20) | p = 0.271a |
BMI | |||
Median (interquartile range) | 22.0 (4.0) | 22.3 (4.1) | p = 0.029a |
BMI class (%) | p = 0.470 | ||
<18.5 | 6.4 | 6.2 | |
18.5–24.9 | 73.8 | 71.8 | |
25.0–29.9 | 15.0 | 16.6 | |
>30 | 4.9 | 5.4 | |
Physical activity level (%) | p = 0.006 | ||
Inactive | 25.5 | 29.5 | |
Walking, cycling etc. > 4 h/week | 37.4 | 34.7 | |
Dedicated fitness training or competitive athletics > 3 h/week | 37.1 | 35.8 | |
Meal regularity (%) | |||
Breakfast every day | 57.1 | 55.9 | p = 0.535 |
Lunch every day | 46.8 | 47.4 | p = 0.752 |
Dinner every day | 29.8 | 32.5 | p = 0.138 |
Bedtime before school-/work-days (time) | p = 0.760 | ||
≤22:00 | 13.4 | 14.0 | |
22:30 | 27.3 | 27.0 | |
23:00 | 30.0 | 29.5 | |
23:30 | 15.5 | 14.4 | |
≥24:00 | 13.8 | 15.1 | |
Current education level (%) | p = 0.004 | ||
High school | 36.5 | 40.8 | |
Vocational school | 26.3 | 26.9 | |
Combined high school + vocational school | 5.5 | 7.7 | |
University | 24.3 | 18.1 | |
Other | 7.4 | 6.5 | |
School success b (%) | p = 0.125 | ||
Clearly above class average | 10.2 | 8.9 | |
Slightly above class average | 32.4 | 30.3 | |
Average | 48.7 | 49.3 | |
Slightly below class average | 7.7 | 10.2 | |
Clearly below class average | 1.1 | 1.4 | |
Future educational plans (%) | p = 0.145 | ||
University | 64.9 | 60.9 | |
Upper secondary school + vocational education | 3.5 | 3.6 | |
Vocational education | 9.2 | 8.8 | |
No studies | 2.0 | 2.4 | |
Don’t know | 20.3 | 24.3 |