Table 1.

Summary of psychosocial measures and Cronbach alpha values.

Scale (composition)	Question	Cronbach alpha
		Pre	Post	Follow-up
Social support (1 item)a	How often do you have a physically active partner (someone to play sports with, to be physically active with, or to walk or cycle together with)?	N/Ab	N/A	N/A
Perceived benefits (12 items)c	A benefit of being physically active (playing sports or walking or cycling somewhere) for me is (1) weight control; (2) less stress; (3) improved fitness; (4) improved health; (5) becoming more productive at work; (6) sleeping well; (7) social interaction; (8) fun; (9) low costs of active transport; (10) flexibility of active transport; (11) no traffic jams; (12) active transport is environment friendly	.78	.80	.84
Perceived barriers (13 items)c	Following reasons hinder me from being physically active (playing sports or walking or cycling somewhere): (1) no discipline; (2) no time; (3) no energy; (4) no company; (5) sweating; (6) no equipment; (7) no showers at work; (8) bad weather; (9) family demands; (10) too much work; (11) carrying luggage during active transport; (12) unsafe traffic; (13) no sports facilities	.76	.77	.75
Self-efficacy (8 items)d	How confident are you to be physically active (playing sports or walking or cycling somewhere) in the following situations: (1) bad weather; (2) busy for work; (3) darkness; (4) after a tiring day at work; (5) sweating; (6) friends or family demanding time; (7) stress; (8) no time	.78	.81	.82
Knowledge (1 item)	What do you think the recommended amount of moderate physical activity is? (1) 60 min on 1 d/wk; (2) 30 min on 3 d/wk; (3) 30 min on 7 d/wk; (4) 60 min on 7 d/wk; (5) I do not know	N/A	N/A	N/A

^a5-point scale from 1 (never) to 5 (very often).

^bN/A: Not applicable.

^c5-point scale from 1 (strongly disagree) to 5 (strongly agree).

^d5-point scale from 1 (know I cannot do it) to 5 (know I can do it).