Table 2 Evaluation questions and indicators of the intervention based on RE-AIM framework

Reach

What percentage of potentially eligible participants will take part and how representative are they?

- number and representativeness of the adolescents participating

Effectiveness

What impact did the intervention have on psychosocial factors of physical activity (PA) and sedentary behavior (SB)?

- social norms, intentions, self-efficacy

What impact did the intervention have on PA and SB?

- weekly frequency of active commuting to school

- weekly frequency and minutes of leisure PA of various intensities

- weekly minutes of daily sitting

- meeting the daily recommendation of moderate-to-vigorous-intensity PA (1 hour on 7

days per week)

- meeting the daily screen time recommendation (≤ 2 hours on 7 days per week)

What impact did the intervention have on parental interference with their child’s PA and SB?

- number of parents interfering with their child’s PA and SB

Adoption

What percentage of settings and intervention agents participated and how representative were they?

- number and representativeness of the schools participating

Implementation

To what extent were the various intervention actions delivered as intended?

- number of teachers delivering the intervention

- number of health education lessons realized as intended

- proportion of students exposed to the intervention during the health education lessons

- number of parents recalling the parental FeetEnergy-leaflet

To what extent did the participants have adverse effects related to active commuting to school, LTPA and sitting?

- number of students with PA restrictions

Maintenance

What were the long-term effects? (Individual level)

- same indicators as in effectiveness

To what extent were the intervention actions maintained? (Setting level)

- use of intervention material by the health education teachers 12 months after the

intervention