Table 2.

Health status of patients at baseline and one year after MI compared according to exposure to PM_2.5 over 1 year after myocardial infarction.

	PM2.5 Concentration (μg/m3)
	Quartile 1 (4.3 to 10.6) n = 978	Quartile 2 (10.7 to 12.0) n = 978	Quartile 3 (12.1 to 13.2) n = 978	Quartile 4 (13.3 to 20.5) n = 979	p-value
Seattle Angina Questionnaire Summary Score
Baseline	79.3 ± 17.2	78.6 ± 16.0	79.0 ± 17.3	75.4 ± 19.0	< 0.001
1-year	90.3 ± 14.5	90.2 ± 14.3	89.2 ± 15.4	87.1 ± 18.2	< 0.001
Dyspnea Score
Baseline	1.02 ± 1.08	0.94 ± 1.07	0.93 ± 1.09	1.21 ± 1.23	< 0.001
1-year	0.71 ± 1.03	0.75 ± 1.07	0.79 ± 1.06	0.97 ± 1.15	< 0.001
SF-12 PCS
Baseline	43.9 ± 12.1	44.0 ± 12.0	43.8 ± 12.0	41.9 ± 12.6	< 0.001
1-year	45.1 ± 11.7	44.6 ± 11.5	44.3 ± 11.8	42.2 ± 12.1	< 0.001

SF-12 PCS=Physical Component Summary of the Medical Outcomes Study 12-item Short Form