Table 3.
Baseline characteristics according to app user group (intervention group only, n 416) among 14–16-year-old adolescents, ‘Snack Track School’ app intervention, Flanders, Belgium, January–April 2016
| App non-users (n 148) | Low app users (n 123) | High app users (n 145) | ||||
|---|---|---|---|---|---|---|
| Mean† | sd | Mean† | sd | Mean | sd † | |
| Number of days logged in (range 0–28) | 0 | 0 | 2·38 | 0·05 | 11·68***,‡ | 0·32 |
| Age (years) | 14·99 | 0·20 | 14·85 | 0·09 | 15·03*** | 0·04 |
| BMI Z-score | 0·14 | 0·40 | −0·02 | 0·08 | 0·09** | 0·08 |
| Sensitivity to reward (range 4–16) | 9·59 | 0·23 | 9·42 | 0·28 | 8·84* | 0·05 |
| Boys (%) | 66·2 | 65·9 | 62·6 | |||
| General education (%) | 11·5 | 28·5 | 52·4**,§ | |||
| Technical education (%) | 50·7 | 44·7 | 36·6**,§ | |||
| Vocational education (%) | 37·8 | 26·8 | 11·0**,§ | |||
| Healthy snack ratio | 35·70 | 3·65 | 38·85 | 6·54 | 45·02*** | 3·12 |
| Awareness (range 0–4) | 1·98 | 0·08 | 2·02 | 0·03 | 2·05 | 0·08 |
| Intention (range 1–5) | 3·19 | 0·20 | 3·13 | 0·27 | 3·40 | 0·09 |
| Attitude taste (range 1–5) | 3·01 | 0·14 | 2·96 | 0·12 | 3·00 | 0·01 |
| Attitude health (range 1–5) | 3·50 | 0·24 | 3·69 | 0·06 | 3·73 | 0·06 |
| Self-efficacy (range 1–5) | 3·31 | 0·09 | 3·45 | 0·09 | 3·50** | 0·10 |
| Habit (range 1–5) | 2·82 | 0·13 | 2·84 | 0·10 | 2·79 | 0·05 |
| Knowledge about the healthiness of snacks (range 0–100) | 26·09 | 0·92 | 25·41 | 0·38 | 23·68 | 0·88 |
*P<0·05, **P<0·01, ***P<0·00.
†
Adjusted for clustering.
‡
t Test for low and high app users.
§
Same χ 2 test for the variable education type.