Table 4. Multivariable odds ratio of lung cancer detection*.

Reference	Categorization by the smoking status	Odds ratio	95% CI	P value
Never-smokers	Smokers¶	1.24	0.82–1.87	0.3
	Smokers with <30 pack-years of smoking	1.00	0.62–1.61	0.99
	Smokers with ≥30 pack-years of smoking	1.71	1.04–2.82	0.03
Smokers with <30 pack-years of smoking	Never-smokers	0.99	0.61–1.60	0.99
	Smokers with ≥30 pack-years of smoking	1.71	1.04–2.80	0.03

*, results were adjusted for age and gender; ^¶, smokers here refer to smokers with <30 pack-years or ≥30 pack-years of smoking.