McKee 2007.

Methods	Design: Controlled before‐after study Duration of follow‐up:10 weeks
Participants	Country: United Kingdom Setting: Primary schools in two villages in Scotland Intervention group: 1 school class, 31 children Control group: 1 school class, 29 children Age: mean age 9 years, range 9‐10 years. Gender: 60% female.
Interventions	Curriculum materials about active travel for teachers and school classes Child and family information pack: advice on how to plan an active journey to school Duration of intervention: 10 weeks
Outcomes	Mean distance travelled to school by car and by walking Effects on inequalities not reported. Adverse effects not reported.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	High risk	Not randomised
Allocation concealment?	High risk	Not randomised
Blinding? All outcomes	High risk	Not feasible. Could have influenced outcomes
Incomplete outcome data addressed? All outcomes	Low risk	Response rate for 'after' survey 92%.
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?	High risk	Similar demographic profiles of schools, and located 5km apart. Mean distance from school differed significantly between groups (intervention group 2215m, control group 1174m). Baseline travel mode differed substantially between schools. Mean distance travelled to school by car at baseline was 2018m in intervention group and 933m in control group.