Table 2 Measurement properties of psychosocial scales
| Variable | Number of items / response format | Example of sample items | Original reference source on which items were based | Cronbach`s alpha |
|---|---|---|---|---|
| Baseline, FU1 and FU2 (range) | ||||
| Social support | Have your family/friends… | [47] | ||
| - family | 6 / 1 (never) - 5 (very often) | … Encouraged you to be physically active? | 0.85-0.87 | |
| - friends | 6 / 1 (never) - 5 (very often) | 0.87-0.88 | ||
| Self-efficacy | 7 / 1 (not at all confident) - 7 (very confident) | I am confident I can participate in planned physical activity when… I am tired | [48] | 0.87-0.89 |
| Outcome expectancies | 6 / 1 (unlikely) – 7 (very likely) | If I am regularly physically active in the next month… Iwill get in better shape | 0.85-0.89 |