Table 4.

Odds ratios (ORs) for COPD according to beverages intake and smoking status.

Variables	Crude OR (95% CI 2)	Fully Adjusted OR 1 (95% CI 2)
Soda Intake Frequency
Per 10 times increasing of monthly intake	0.96 (0.93, 0.98)	1.04 (1.01, 1.07)
Never	Ref.	Ref.
≤4 times/week	0.79 (0.69, 0.91)	0.94 (0.80, 1.10)
4–7 times/week	0.60 (0.45, 0.78)	1.20 (0.90, 1.60)
>7 times/week	0.67 (0.56, 0.82)	1.30 (1.04, 1.64)
p for trend	<0.001	0.041
Coffee Intake Frequency
Per 10 times increasing of monthly intake	1.02 (1.00, 1.04)	1.01 (0.98, 1.03)
Never	Ref.	Ref.
≤4 times/week	1.04 (0.86, 1.25)	1.02 (0.83, 1.26)
4–7 times/week	1.30 (1.08, 1.56)	1.10 (0.90, 1.34)
>7 times/week	1.22 (1.04, 1.45)	1.12 (0.92, 1.37)
p for trend	0.004	0.467
Green Tea Intake Frequency
Per 10 times increasing of monthly intake	0.92 (0.87, 0.97)	0.98 (0.93, 1.03)
Never	Ref.	Ref.
≤4 times/week	0.73 (0.63, 0.84)	1.02 (0.87, 1.19)
4–7 times/week	0.69 (0.52, 0.90)	0.97 (0.73, 1.30)
>7 times/week	0.53 (0.35, 0.80)	0.67 (0.42, 1.08)
p for trend	<0.001	0.331
Smoking Status
Never	Ref.	Ref.
Past-smoker	3.59 (3.09, 4.18)	1.78 (1.42, 2.24)
Current-smoker	3.80 (3.25, 4.43)	2.58 (2.06, 3.24)

¹ Fully adjusted model was adjusted for sex, age, monthly income, education level, drinking status, smoking status, beverage intake, and BMI. ² CI, confidence interval.