Table 2.
Characteristics of the sample of 14–16-year-old adolescents (n 988) from six secondary schools (three intervention schools, three control schools) in two (matched) cities, ‘Snack Track School’ app intervention, Flanders, Belgium, January–April 2016
| Control group (n 572) | Intervention group (n 416) | |||
|---|---|---|---|---|
| Mean† | sd | Mean† | sd | |
| Age (years) | 14·91 | 0·08 | 14·96 | 0·10 |
| BMI Z-score | 0·13 | 0·04 | 0·08 | 0·06 |
| Sensitivity to reward (range 4–16) | 8·65 | 0·26 | 9·28 | 0·11 |
| Boys (%) | 57·87 | 61·52 | ||
| General education (%) | 34·62 | 30·77 | ||
| Technical education (%) | 51·92 | 43·99 | ||
| Vocational education (%) | 13·46 | 25·24 | ||
| Healthy snack ratio | 43·29 | 2·78 | 39·88 | 5·13 |
| Awareness (range 0–4) | 2·10 | 0·03 | 2·02 | 0·06 |
| Intention (range 1–5) | 3·43 | 0·09 | 3·25 | 0·20 |
| Attitude taste (range 1–5) | 3·17 | 0·02 | 2·99 | 0·09 |
| Attitude health (range 1–5) | 3·70 | 0·08 | 3·64 | 0·14 |
| Self-efficacy (range 1–5) | 3·56 | 0·07 | 3·42 | 0·10 |
| Habit (range 1–5) | 2·89 | 0·09 | 2·82 | 0·04 |
| Knowledge about the healthiness of snacks (range 0–100) | 25·26 | 0·66 | 25·03 | 0·30 |
†
Adjusted for clustering (three clusters per group).