Table 1.

Clinicopathologic characteristics of patients

Clinicopathologic parameters	Number of cases		Average survival (month)	95% CI	χ2	p
	n	%
Age					163.160	< 0.001
18–65	2071	54.41	15.061	14.107–16.014
≥ 66	1735	45.59	8.806	8.070–9.542
Marital status					43.985	< 0.001
Non-married	1786	46.93	10.377	9.550–11.205
Married	2020	53.07	13.808	12.890–14.727
Primary site					10.727	0.013
Main bronchus	187	4.91	9.0410	6.979–11.102
Upper lobe, lung	2390	62.80	12.503	11.708–13.299
Middle lobe, lung	170	4.47	13.994	10.790–17.198
Lower lobe, lung	1059	27.82	11.686	10.520–12.852
Race					16.999	< 0.001
White	2978	78.24	11.861	11.172–12.549
Black	510	13.40	11.708	10.061–13.355
Other	318	8.36	15.783	13.418–18.148
Surgery					184.795	< 0.001
No surgery	3463	90.99	10.550	9.978–11.121
Surgery	343	9.01	28.233	25.065–31.401
Gender					31.990	< 0.001
Male	1970	51.76	10.804	10.008–11.600
Female	1836	48.24	13.706	12.746–14.667
Grade					71.301	< 0.001
I	140	3.68	19.020	14.870–23.170
II	880	23.12	15.229	13.807–16.651
III	2446	64.27	10.996	10.270–11.722
IV	340	8.93	9.712	8.026–11.398
Laterality					0.475	0.491
Left	1596	41.93	12.216	11.293–13.138
Right	2210	58.07	12.153	11.318–12.988
Histologic type					98.416	< 0.001
Squamous cell carcinoma	555	14.58	8.131	7.085–9.176
Adenocarcinoma	2201	57.83	14.318	13.411–15.225
Small cell lung cancer	335	8.80	9.832	8.156–11.507
Large cell carcinoma	101	2.65	8.456	6.289–10.623
Others	614	16.13	10.049	8.656–11.442
T stage					58.295	< 0.001
T1	430	11.30	16.512	14.280–18.744
T2	1283	33.71	13.424	12.311–14.537
T3	1014	26.64	10.74	9.625–11.855
T4	1079	28.35	10.234	9.219–11.248
N stage					25.029	< 0.001
N0	1078	28.32	14.532	13.183–15.882
N1	400	10.51	12.973	11.025–14.921
N2	1778	46.72	11.123	10.302–11.943
N3	550	14.45	10.118	8.739–11.496
Overall	3806	100.00	12.234	11.604–12.864