Mutrie 2002.

Methods	Design: Randomised controlled trial. Control group then received intervention at 6 months. Duration of follow‐up: 6 and 12 months
Participants	Country: United Kingdom Setting: Three city workplaces in Glasgow, Scotland Intervention group n=145 Control group n=150 Mean age 38 years (range 19‐69). 64% women. 76% were social economic class 1 or 2. 70% travelled between 2 and 10 miles to work.
Interventions	'Walk in to work out' pack: written interactive self‐help materials to support active travel; reflective safety accessories Duration of intervention: pack delivered at baseline, with no further subsequent intervention
Outcomes	SF‐36 including sub scales Minutes per week spent walking to work. Effects on inequalities not reported. Adverse effects not reported.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Low risk	Randomised by automatic data management system
Allocation concealment?	Low risk	Randomisation process not accessible to the research assistant entering the data
Blinding? All outcomes	High risk	Not feasible for participants or those administering intervention. Statistician blind to group identity. Could have influenced outcomes
Incomplete outcome data addressed? All outcomes	High risk	34% of participants lost to follow up at 6 months (30% intervention group, 39% control). Reason for missing outcome data could be related to outcome. Loss to follow up greater in control group
Free of selective reporting?	Unclear risk	Not clear that all pre‐specified outcomes were included
Free of other bias?	Low risk	No other sources of bias identified
Adequate matching of intervention / control groups?	Unclear risk	Randomised but baseline demographic data not reported. Participants in intervention and control group matched by distance travelled to work