Table 1. Baseline characteristics of the LUAD patients.

Characteristic		N	(%)
Age	≤65	255	49.4
	>65	261	50.6
Gender	Female	286	53.5
	Male	249	46.5
Smoking history	No	75	14.4
	Yes	446	85.6
T stage	T1	175	32.9
	T2	289	54.3
	T3	49	9.2
	T4	19	3.6
N stage	N0	348	67.1
	N1	95	18.3
	N2	74	14.3
	N3	2	0.4
M stage	M0	361	93.5
	M1	25	6.5
Pathologic stage	Stage I	294	55.8
	Stage II	123	23.3
	Stage III	84	15.9
	Stage IV	26	4.9

Notes.

The definitions of T, N, M are primary tumor, regional lymph nodes and distant metastasis, respectively.