Table 2 Crude and adjusted odd ratios (95% confidence interval) of the meteorological and pollution matter (mean of 30 days before the index date) for ischemic heart disease.

Characteristics	Odds ratio for ischemic heart disease (95% CI)
Characteristics	Crude^a	P-value	Adjusted^a,b	P-value	Final^a,c	P-value
Mean temperature for 30 days (°C)	1.00 (1.00–1.01)	0.864	0.90 (0.65–1.24)	0.506
Highest temperature for 30 days (°C)	1.00 (1.00–1.01)	0.935	1.04 (0.89–1.21)	0.660
Lowest temperature for 30 days (°C)	1.00 (1.00–1.01)	0.798	1.09 (0.92–1.29)	0.334
Relative humidity for 30 days (%)	1.00 (0.99–1.00)	0.271	0.99 (0.98–1.00)	0.045*
Ambient atmospheric pressure for 30 days (hPa)	1.00 (0.99–1.01)	0.697	1.00 (0.99–1.01)	0.923
SO₂ for 30 days (0.01 ppm)	1.36 (1.07–1.75)	0.014*	1.74 (1.18–2.56)	0.005*	1.36 (1.06–1.75)	0.015*
NO₂ for 30 days (0.1 ppm)	0.59 (0.31–1.11)	0.099	0.40 (0.15–1.07)	0.066
O₃ for 30 days (0.01 ppm)	1.04 (0.98–1.10)	0.227	0.98 (0.89–1.09)	0.727
CO for 30 days (ppm)	1.01 (0.77–1.32)	0.939	1.02 (0.61–1.73)	0.935
PM₁₀ for 30 days (10 μg/m³)	1.00 (0.97–1.04)	0.859	1.01 (0.96–1.07)	0.593

*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.

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