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