Cross-sectional and longitudinal associations between the built environment and walking: effect modification by socioeconomic status.

Their study found evidence of effect modification only for the association between increases in accessibility to public transit (a composite measure of proximity, number of stops, and frequency of service) with daily steps, such that there were no statistically significant associations among the two higher SES groups, but a marginally significant negative association for the low SES group (i.e., defined by social housing recipient status [ 16 ]).

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