Table 2 Lower and upper bound threshold values for the traffic light system by aim

Aim 1

 Recruitment rate

 < 40%

 ≥ 60%

 Eligibility rate

 < 60%

 ≥ 80%

 Consent rate

 < 80%

 ≥ 90%

 Participation rates

 < 50%

 ≥ 70%

 Retention rates

 < 40%

 ≥ 60%

Aim 2

 Engagement behavior in the PAS intervention

 < 40%

 ≥ 60%

 Quantitative acceptability of the PAS intervention

 < 60%

 ≥ 80%

 Dichotomous acceptability of the PAS intervention

 < 60%

 ≥ 80%

 Qualitative acceptability of the PAS intervention

at least one potentially serious problem

absence of a potentially serious problem

 Quantitative acceptability of accelerometer-based assessment of physical activity

 < 60%

 ≥ 80%

 Dichotomous acceptability of accelerometer-based assessment of physical activity

 < 60%

 ≥ 80%

 Qualitative acceptability of accelerometer-based assessment of physical activity

at least one potentially serious problem

absence of a potentially serious problem

Aim 3

 Intention-to-treat approach

 < 0.00

 ≥ 0.20