Table 4 Questionnaire-based primary indicators of effectiveness at baseline (B) and 4 weeks after the intervention (F1) in the intervention (INT) and comparison (COM) group and the differences in change between the groups from B to F1 and 95% confidence intervals (95% CI)

• Walking or cycling as a primary transportation mode to school, n (%)

302 (53.5)

273 (46.8)

398 (53.1)

347 (48.6)

−2.8 (−6.2 to 0.6)

• Weekly number of days walking or cycling to school (0–5 days), mean (SD)

3.0 (2.3)

2.8 (2.3)

3.0 (2.4)

2.8 (2.4)

−0.0 (−0.2 to 0.2)

• Weekly number of days with at least 1 h of brisk leisure PA (0-7 days), mean (SD)

3.6 (2.0)

3.7 (1.9)

3.5 (1.9)

3.4 (1.9)

0.3 (0.1 to 0.6)^b)

• Meeting PA recommendations (yes), n (%)^c)

43 (7.7)

53 (9.2)

50 (6.7)

34 (4.8)

4.1 (2.5 to 5.7)^b)

Participation in organized sports (yes), n (%)

204 (36.6)

202 (35.1)

272 (36.9)

274 (38.8)

−1.0 (−2.1 to 0.1)

• Times per week, mean (SD)

2.4 (2.3)

2.4 (2.4)

2.1 (2.1)

2.2 (2.3)

−0.0 (−0.2 to 0.1)

• Weekly duration, mean (SD)

4.5 (5.5)

4.6 (5.5)

3.8 (4.9)

4.1 (6.0)

−0.0 (− 0.4 to 0.4)

• Weekly number of days with > 2 h of screen time (0–7 days), mean (SD)

3.2 (2.2)

3.1 (2.2)

3.4 (2.2)

3.4 (2.1)

−0.1 (− 0.3 to 0.1)