Table 4.

Adjusted odd ratios (95% confidence interval) of the meteorological and pollution matter for ischemic heart disease according to age and sex in the final model.

Characteristics	Means of 30 days		Means of 365 days
	Odd ratios (95% CI)	P-value	Odd ratios (95% CI)	P-value
Age < 60 years old (n = 1820)
O3 (0.01 ppm)			2.21 (1.46–3.34)	< 0.001*
PM10 (10 μg/m3)			1.28 (1.03–1.60)	0.027*
Age ≥ 60 years old (n = 8955)
SO2 (0.01 ppm)	1.37 (1.04–1.79)	0.025*	1.67 (1.02–2.72)	0.042*
Relative humidity (%)			0.97 (0.96–0.99)	0.001*
O3 (0.01 ppm)			1.42 (1.16–1.75)	0.001*
PM10 (10 μg/m3)			1.12 (1.01–1.25)	0.032*
Men (n = 7235)
SO2 (0.01 ppm)	1.45 (1.07–1.96)	0.016*
O3 (0.01 ppm)			1.54 (1.24–1.92)	< 0.001*
PM10 (10 μg/m3)			1.19 (1.06–1.32)	0.003*
Women (n = 3540)
Relative humidity (%)			0.95 (0.93–0.98)	< 0.001*
NO2 (0.1 ppm)			0.09 (0.02–0.39)	0.002*
Low income (n = 5435)
SO2 (0.01 ppm)	1.43 (1.00–2.04)	0.050*
O3 (0.01 ppm)			1.69 (1.32–2.18)	< 0.001*
PM10 (10 μg/m3)			1.25 (1.10–1.41)	0.001*
High income (n = 5340)
Relative humidity (%)			0.97 (0.95–0.99)	0.001*
SO2 (0.01 ppm)			2.09 (1.13–3.88)	0.019*
NO2 (0.1 ppm)			0.22 (0.07–0.69)	0.010*
Urban (n = 4155)
SO2 (0.01 ppm)	1.62 (1.05–2.49)	0.028*
Relative humidity (%)			0.98 (0.96–0.99)	0.009*
O3 (0.01 ppm)			2.08 (1.60–2.70)	< 0.001*
PM10 (10 μg/m3)			1.39 (1.21–1.60)	< 0.001*
Rural (n = 6620)
Relative humidity (%)			0.97 (0.95–0.99)	0.008*
SO2 (0.01 ppm)			1.71 (1.00–2.93)	0.050*

*Conditional logistic regression model; Significance at P < 0.05.

^aStratified model for age, sex, income, and region of residence.

^bFinal model was adjusted for obesity, smoking status (current smoker compared to nonsmoker or past smoker), frequency of alcohol consumption (≥ 1 time a week compared to < 1 time a week), CCI score, relative humidity, SO₂, NO₂, O₃, CO, and PM₁₀ using the backward selection method.