Table 3.

Crude and adjusted odd ratios (95% confidence interval) of the meteorological and pollution matter (mean of 365 days before the index date) for ischemic heart disease.

Characteristics	Odds ratio for ischemic heart disease (95% CI)
	Crudea	P-value	Adjusteda,b	P-value	Finala,c	P-value
Mean temperature for 365 days (°C)	1.07 (1.03–1.12)	0.001*	0.89 (0.40–1.96)	0.768
Highest temperature for 365 days (°C)	1.06 (1.02–1.11)	0.009*	1.00 (0.70–1.43)	0.989
Lowest temperature for 365 days (°C)	1.06 (1.02–1.10)	0.001*	1.09 (0.72–1.66)	0.689
Relative humidity for 365 days (%)	0.98 (0.96–0.99)	0.002*	0.97 (0.95–0.99)	0.001*	0.98 (0.96–0.99)	0.002*
Ambient atmospheric pressure for 365 days (hPa)	1.00 (0.99–1.01)	0.413	1.01 (0.99–1.02)	0.516
SO2 for 365 days (0.01 ppm)	1.84 (1.22–2.77)	0.004*	1.88 (1.12–3.18)	0.017*	1.58 (1.01–2.47)	0.045*
NO2 for 365 days (0.1 ppm)	0.35 (0.16–0.79)	0.011*	0.18 (0.04–0.90)	0.037*
O3 for 365 days (0.01 ppm)	1.31 (1.15–1.50)	< 0.001*	1.27 (0.98–1.64)	0.070	1.53 (1.27–1.84)	< 0.001*
CO for 365 days (ppm)	0.73 (0.46–1.15)	0.174	0.81 (0.38–1.70)	0.569
PM10 for 365 days (10 μg/m3)	1.01 (0.95–1.09)	0.701	1.19 (1.12–3.18)	0.001*	1.14 (1.04–1.26)	0.007*

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

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

^bAdjusted 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, mean temperature, highest temperature, lowest temperature, relative humidity, atmospheric pressure, SO₂, NO₂, O₃, CO, and PM₁₀.

^cFinal 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.