“…Most studies assessed national samples, while four studies used state data, 8,12,24,25 often in comparison to other states, and five studies used local data 9,18,23,48,49 . Fourteen of the studies included the passage of a state or local mandate as a stimulus for studying associations with PSL 12,15,16,19–21,23–28,35,42 . Outcomes were measured in terms of the individual unit of analysis except for eight studies that used the organization 16,23,24,40,41,44,47,48 and seven studies considered the region as the unit of analysis 12,19–21,26,28,35 …”