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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

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

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
Female 114 1.31 1.03-1.65 0.03
Age < 65 years 220 1.09 0.90-1.32 0.36 0.14
≥ 65 years 118 1.37 1.07-1.75 0.01
Race White 207 1.15 0.94-1.41 0.18 0.83
Other 32 1.21 0.78-1.89 0.40
Smoker Yes 104 1.07 0.81-1.41 0.65 0.75
No 106 1.22 0.92-1.60 0.17
Prior myocardial infarction Yes 54 1.52 1.04-2.22 0.03 0.11
No 185 1.08 0.87-1.33 0.49
Prior CABG Yes 10 1.27 0.60-2.66 0.53 0.80
No 229 1.15 0.95-1.40 0.15
Prior PCI Yes 45 1.37 0.91-2.05 0.13 0.36
No 195 1.11 0.90-1.37 0.33
Prior PAD Yes 16 1.31 0.66-2.61 0.45 0.76
No 222 1.17 0.96-1.43 0.12
Hypertension Yes 160 1.39 1.10-1.76 <0.01 0.02
No 76 0.90 0.66-1.23 0.51
Left ventricle ejection fraction < 35% 48 1.35 0.94-1.93 0.10 0.37
≥ 35% 133 1.11 0.85-1.43 0.44
Diabetes Yes 44 1.15 0.75-1.76 0.53 0.98
No 152 1.16 0.91-1.46 0.23
Dyslipidemia Yes 143 1.24 0.97-1.58 0.09 0.60
  No 94 1.12 0.85-1.49 0.42  
  1. *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.