The effect of Philadelphia and Pennsylvania Clean Indoor Air Act on food services and drinking places sales and numbers, 1998-2011.

The Pennsylvania CIAA was associated with an immediate decrease in adjusted special food services sales (β 22 = −0.030, P = .02) in the rest of the state ( Table 1 , Figure 1 ), along with an increasing trend for the number of special food services restaurants in the 4 surrounding counties (β 32 = 0.030, P < .001)( Table 2 , Figure 2 ).

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The Philadelphia CIAA was associated with a decreasing trend for the adjusted number of special food services in the 4 surrounding counties (β 31 = −0.018, P = .008) that was coupled with an increasing trend in Philadelphia (β 31 = 0.017, P = .002).

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