Table 3: The adjusted risk ratios of parameters associated with airflow obstruction by multivariate analysis

Parameters	FEV1/FVC ratio<0.7		<LLN
	Risk ratio (95%CI)	p value	Risk ratio (95%CI)	p value
Presence of CRS	2.65 (1.09-6.53)	0.0318	2.46 (1.02-5.96)	0.0443
Age ≥ 70 yr	3.45 (1.22-9.74)	0.0199	2.42 (0.83-6.89)	0.1
Male gender	1.86 (0.61-5.90)	0.3	2.64 (0.91-7.47)	0.1
Positive history of cigarette smoking	3.20 (1.13-9.82)	0.0285	5.90 (2.40-16.2)	<0.0001

CRS: Chronic Rhinosinusitis, FEV₁: Forced Expiratory Volume in 1 second, FVC: Forced Vital Capacity, LLN: Lower Limit of the Normal