Table 3.

Results of multiple logistic regression analysis of the association between vitamin E intake and COPD, weighted.

	Model 1		Model 2		Model 3
	OR (95%CI)	p value	OR (95%CI)	p value	OR (95%CI)	p value
Q1	Ref	Ref	Ref	Ref	Ref	Ref
Q2	0.83 (0.46,1.50)	0.52	0.84 (0.44,1.59)	0.57	0.89 (0.47,1.68)	0.71
Q3	0.48 (0.33,0.70)	<0.001	0.48 (0.31,0.73)	<0.01	0.57 (0.36,0.91)	0.02

OR, odds ratio; 95% CI, 95% confidence interval. Q1 (≤5.370 mg/day), Q2 (5.370 to 9.230 mg/day), Q3 (≥9.230 mg/day).

Model 1: Adjusted for no covariates.

Model 2: Adjusts for basic information such as age, ethnicity, and gender.

Model 3: Adjust for all confounding factors.