Table 3.

Cox regression model

Model	HR	95% CI	P value
Model 1*	2.42	1.26 to 4.67	0.008
Model 2†	2.32	1.15 to 4.70	0.019
Model 3‡	2.32	1.14 to 4.71	0.020
Model 4§	3.35	1.61 to 6.96	0.001

*Univariate Cox regression model.

†Multivariable Cox regression models adjusted for personal basic information: age (40–59 or ≥60 years), gender (male or female), BMI (underweight, normal, overweight or obese) and creatinine level (normal or high).

‡Additionally adjusted for environmental exposure: smoking (yes or no) and drinking (yes or no).

§Further adjusted for medical history: chronic bronchitis (yes or no), bronchiectasis (yes or no), tuberculosis (yes or no), pneumonia (yes or no) and diabetes (yes or no).

HR, Hazard Ratio.