Table 3. Risk factor for mortality in patients with lung cancer assessed by Cox proportional hazards model.

Parameter	HR	95% CI	p-value
Univariate analysis
Age	1.048	1.035–1.061	<0.001
Male sex	1.751	1.345–2.280	<0.001
Under weight patient (BMI<18.5)	2.009	1.384–2.915	<0.001
BMI, kg/m2	0.906	0.869–0.945	<0.001
Ever smoker	1.714	1.323–2.220	<0.001
Asymptomatic patient	0.265	0.160–0.439	<0.001
Weight loss	1.577	1.029–2.417	0.037
Performance status 2–4	3.135	2.206–4.456	<0.001
Small cell lung cancer	2.488	1.807–3.425	<0.001
Distant metastasis	4.142	3.179–5.397	<0.001
Any treatment	0.242	0.187–0.314	<0.001
Multivariate analysis
Age	1.037	1.020–1.055	<0.001
BMI, kg/m2	0.904	0.864–0.945	<0.001
Ever smoker	2.003	1.394–2.876	<0.001
Asymptomatic patient	0.387	0.195–0.765	0.006
Small cell lung cancer	1.627	1.077–2.458	0.021
Distant metastasis	3.990	2.812–5.661	<0.001
Any treatment	0.364	0.253–0.522	<0.001

HR: hazard ratio; CI: confidence interval; BMI: body mass index.