Ambient fine particulate air pollution triggers ST-elevation myocardial infarction, but not non-ST elevation myocardial infarction: a case-crossover study

Table 4 Risk (and 95% confidence intervals) of STEMI associated with each 7.1 μg/m ³ increase in PM _2.5 concentration in the previous hour

Characteristic	Category	n*	Odds ratio	95% confidence interval	p-value	Interaction term p-value
Gender	Male	224	1.11	0.91-1.35	0.30	0.27
Gender	Female	114	1.31	1.03-1.65	0.03	0.27
Age	< 65 years	220	1.09	0.90-1.32	0.36	0.14
Age	≥ 65 years	118	1.37	1.07-1.75	0.01	0.14
Race	White	207	1.15	0.94-1.41	0.18	0.83
Race	Other	32	1.21	0.78-1.89	0.40	0.83
Smoker	Yes	104	1.07	0.81-1.41	0.65	0.75
Smoker	No	106	1.22	0.92-1.60	0.17	0.75
Prior myocardial infarction	Yes	54	1.52	1.04-2.22	0.03	0.11
Prior myocardial infarction	No	185	1.08	0.87-1.33	0.49	0.11
Prior CABG	Yes	10	1.27	0.60-2.66	0.53	0.80
Prior CABG	No	229	1.15	0.95-1.40	0.15	0.80
Prior PCI	Yes	45	1.37	0.91-2.05	0.13	0.36
Prior PCI	No	195	1.11	0.90-1.37	0.33	0.36
Prior PAD	Yes	16	1.31	0.66-2.61	0.45	0.76
Prior PAD	No	222	1.17	0.96-1.43	0.12	0.76
Hypertension	Yes	160	1.39	1.10-1.76	<0.01	0.02
Hypertension	No	76	0.90	0.66-1.23	0.51	0.02
Left ventricle ejection fraction	< 35%	48	1.35	0.94-1.93	0.10	0.37
Left ventricle ejection fraction	≥ 35%	133	1.11	0.85-1.43	0.44	0.37
Diabetes	Yes	44	1.15	0.75-1.76	0.53	0.98
Diabetes	No	152	1.16	0.91-1.46	0.23	0.98
Dyslipidemia	Yes	143	1.24	0.97-1.58	0.09	0.60
	No	94	1.12	0.85-1.49	0.42

*Of the total possible N = 338 STEMI patients, some had missing data on subject characteristics and thus were not included in the specific stratified analysis.

ISSN: 1743-8977