Table 1 EMA data collection characteristics
EMA data collection | Study 1 (physical activity) | Study 2 (snacking) | Study 3 (physical activity) | Study 4 (sedentary behavior) |
|---|---|---|---|---|
Study duration | 7 days | 7 days | 7 days | 7 days |
Sampling strategy | Time-based | Time-based | Event-based (after 5’ of sustained walking) | Event-based (after 30’ of sedentary behaviour) |
Sampling frequency | 6 triggers/day | 5 triggers/day | Depending on the number of walking events; max. of 6 triggers/day | Depending on the number of sedentary events; max. of 6 triggers/day |
Minimum sampling interval | 30 min | 30 min | 60 min | 120 min |
Sampling device and application | Smartphone with SEMA3 | Smartphone with SEMA3 | Smartphone with HealthReact (linked to Fitbit) | Smartphone with HealthReact (linked to Fitbit) |
Number of items per prompt | 15 items (evaluated on a 7 point Likert scale) | 10 items (evaluated on a 7 point Likert scale) | 1 to 12 items (depending on their answers) | 1 to 14 items (depending on their answers) |
Number of reminders | Two reminders (after 5’ and 10’) | Two reminders (after 5’ and 10’) | Seven reminders (after 10’, 20’, 25’, 26’, 27’, 28’, 29’) | Seven reminders (after 10’, 20’, 25’, 26’, 27’, 28’, 29’) |
Delay allowed to answer the survey* | 20 min | 20 min | 30 min | 30 min |