Table 2: The risk ratios of parameters associated with airflow obstruction by univariate analysis

Parameters	FEV1/FVC ratio<0.7		<LLN
	Risk ratio (95%CI)	p value	Risk ratio (95%CI)	p value
Presence of CRS	3.29 (1.45-7.47)	0.0075	3.04 (1.35-6.82)	0.0088
Nasal polyp	3.83 (0.83-17.6)	0.1	1.98 (0.37-10.6)	0.3
Age ≥ 70 yr	3.77 (1.49-9.55)	0.0095	2.84 (1.11-7.24)	0.0504
Male gender	4.36 (1.75-10.9)	0.0010	5.81 (2.23-15.2)	0.0001
Positive history of cigarette smoking	5.07 (2.09-12.3)	0.0002	6.70 (2.67-16.8)	<0.0001

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