Table 3.

Relation between clinical variables and survival

Variable	Category	Available No. for Survival (Died/Total)	Median survival (Mean/mo.)	Log-rank P
Gender	Male	71/130	45/43.856 ± 2.384	0.064
	Female	17/45	-/51.978 ± 3.844
Age	<60	40/84	46/44.253 ± 2.859	0.451
	≥60	48/91	-/47.786 ± 2.915
Histological type	ADC	48/91	46/45.253 ± 2.769	0.832
	SCC	34/74	-/46.459 ± 3.287
	Others	6/10	46/47.300 ± 6.989
Differentiation	Poor-Moderate	59/121	-/46.121 ± 2.500	0.727
	Well	29/54	49/45.556 ± 3.545
Tumor size	T1	16/31	47/44.548 ± 4.917	0.967
	T2	40/83	-/46.910 ± 2.978
	T3	15/29	54/46.000 ± 4.921
	T4	17/32	46/44.281 ± 4.693
Lymph node invasion	N0	36/96	-/52.271 ± 2.629	<0.001a
	N1	24/37	36/40.378 ± 4.190
	N2	26/40	35/37.650 ± 4.354
Distant metastasis	M0	82/167	-/46.608 ± 2.089	0.094
	M1	6/8	15/30.375 ± 7.756
Clinical stage	I	25/64	-/51.672 ± 3.229	0.034 a
	II	19/40	-/48.025 ± 4.172
	III	38/63	37/40.571 ± 3.447
	IV	6/8	15/30.375 ± 7.756

ADC, Adenocarcinoma; SCC, Squamous cell carcinoma; No, number; mo, month;

^aStatistically significant.