Table 3.

Clinical characteristics of patients in ESCC datasets.

Characteristic	ESCC-train	ESCC-test	P	ESCC-valid	P
NO. of samples	60	59		60
Age (median)	59	59	0.8564*	60.23973	0.6180*
Gender			0.6610		1
Male	48	50		48
Female	12	9		12
Smoke			0.1340		0.8531
Yes	36	44		34
No	24	15		26
Alcohol			0.7591		0.5805
Yes	36	38		32
No	24	21		28
Tumour location			0.4270		0.1031
Upper	7	7		6
Middle	38	31		28
Lower	15	21		26
Tumour grade			0.1966		0.2891
Well differntiated	16	8		9
Moderately differentiated	29	35		34
Poorly differentiated	15	16		17
T stage			0.6019		0.0002
T1	3	5		4
T2	12	8		7
T3	29	33		48
T4	16	13		1
N stage			0.1938		0.6360
N0	24	30		29
N1	26	16		20
N2	7	6		9
N3	3	7		2
TNM stage			0.2333		0.1900
I	1	5		4
II	25	22		30
III	34	32		26
Death at follow-up			1		0.5786
Yes	37	36		33
No	23	23		27
Median survival (months)	31.9833	32.2	0.9576*	39.3333	0.1825*

P-Values are calculated by χ2 test or Fisher’s exact test, unless otherwise stated. *Wilcoxon rank-sum test.