1.

Patients demographic characteristics and PSM characteristics between two groups

Characteristics	Before PSM (n)				After PSM (n)
	≤35 d (N=391)	>35 d (N=336)	P		≤35 d (N=258)	>35 d (N=258)	P
PSM, propensity score matching; NOS, not otherwise specified; ECOG, Eastern Cooperative Oncology Group.
Age			0.034				1.000
≤65 years	345	277			230	230
Gender			0.243				0.464
Male	245	225			160	169
Smoking history			0.766				0.378
No	184	154			131	120
Histology subtype			0.239				0.562
Squamous carcinoma	104	109			75	85
Adenocarcinoma	273	215			176	167
Mixed	5	8			4	5
Large cell carcinoma	2	1			1	1
Carcinoma NOS	7	3			2	0
Differentiation			0.082				0.629
Poor	83	87			60	65
Poor-moderate	123	77			72	63
Moderate	143	133			101	106
Moderate-well	16	22			10	151
Well	14	9			9	5
Unknown	12	8			6	4
Lymphatic involvement stage			0.341				0.914
N0	79	87			53	59
N1	126	101			75	76
N2	185	147			129	122
N3	1	1			1	1
Clinical stage			0.430				0.754
IB	58	59			37	44
IIA	108	89			64	70
IIB	20	20			14	13
IIIA	196	154			135	121
IIIB	9	14			8	10
Performance status (ECOG)			0.590				0.262
0	76	63			36	43
1	313	269			220	215
2	2	4			2	0
Adjuvant radiotherapy			0.754				0.202
No	331	288			207	219
Charlson			0.218				0.742
0	282	254			195	194
1	72	63			44	50
2	31	14			17	12
3	6	5			2	2