Table 2. Logistic regression analysis of patient characteristics associated with COPD, KRAS and EGFR.

Characteristics	COPD			KRAS			EGFR
	HR	95% CI	p-value	HR	95% CI	p-value	HR	95% CI	p-value
Sex	0.78	0.48–1.29	0.33	2.61	1.56–4.39	<0.001	1.21	0.51–2.90	0.66
Age	1.05	1.02–1.07	<0.001	0.99	0.97–1.01	0.39	0.98	0.95–1.02	0.39
Smoking	8.28	2.61–26.24	<0.001	4.10	1.14–14.79	0.03	0.11	0.04–0.32	<0.001
COPD	-	-	-	1.29	0.77–2.18	0.34	0.44	0.18–1.09	0.08

HR: Hazard ratio; CI: Confidence interval