1.

倾向性评分匹配前后两组患者临床资料的对比

Comparison of clinical data between the two groups before and after propensity score matching (PSM)

Variable	Before				After
	LNR (n)		P		LNR (n)		P
	< 0.16 (674)	≥0.16 (188)			< 0.16 (674)	≥0.16 (188)
Gender			0.067				0.089
Male	551	165			152	165
Female	123	23			36	23
Age (year)			0.232				0.643
≤72	604	162			166	162
≥73	70	26			22	26
Tumor size (mm)			0.079				1.000
≤72	563	146			147	146
≥73	111	42			41	42
Number of lymph nodes tested			< 0.001				0.531
≤8	141	76			83	76
≥9	533	112			105	112
Primary site			0.160				0.266
Cervical esophagus	2	0
Upper third of esophagus	9	3			2	3
Middle third of esophagus	93	14			19	14
Lower third of esophagus	525	152			157	152
Abdominal esophagus	7	2			2	2
Overlapping lesion of esophagus	22	12			3	12
Thoracic esophagus	16	5			5	5
Grade			0.094				0.314
Ⅰ	30	8			5	8
Ⅱ	303	68			73	68
Ⅲ	333	107			109	107
Ⅳ	8	5			1	5
Pathological type			0.006				0.226
Squamous cell carcinoma	157	24			36	24
Adenocarcinoma	456	147			138	147
Others	61	17			14	17
T stage			0.006				0.522
T1	64	12			8	12
T2	121	19			21	19
T3	451	138			146	138
T4	38	19			13	19
M stage			0.004				0.527
M0	656	174			178	174
M1	18	14			10	14
Race			0.992				0.927
White	598	167			165	167
Black	35	10			13	10
Asian	35	9			8	9
Others	6	2			2	2