TABLE 2.

Percentage Change in AMI Mortality Rates After the Implementation of Local or State Comprehensive Smoking Bans Compared With Before the Ban: Massachusetts, 1999–2006

			% Change in AMI Mortality Ratesa
Prior Local Comprehensive Ban in Effectb	Population Aged ≥ 35 y	No. of AMI Deaths	After Local Ban, % (95% CI)	P	After State Ban, % (95% CI)	P
Yes (61 cities and towns)	835 597	6 176	−2.9% (−9.6%, 4.3%)	.41	−0.7% (−8.2%, 7.5%)	.87
No (290 cities and towns)	2 507 320	20 806	…	…	−9.2% (−13.4%, −4.8%)	< .001

Note. AMI = acute myocardial infarction; CI = confidence interval. The comprehensive state smoking ban was implemented in July 2004.

^aAdjusted for trend, season, influenza, fine particle air pollution, town-specific demographics, and a random intercept for each city or town.

^bPrior local comprehensive smoking ban similar to the state law.