Table 4. Clinicopathological features of ESCC patients in the training and validation cohorts.

Features		Training cohort (128)		Validation cohort (40)		P
		No.	%	No.	%
Sex	Male	94	73.4	31	77.5	0.607
	Female	34	26.6	9	22.5
Age	Median	65		63		0.744
	Range	51–80		42–81
Clinical stage	I–II	80	62.5	29	72.5	0.247
	III–IV	48	37.5	11	27.5
Histological grade	G1	19	14.8	9	22.5	0.469
	G2	72	56.3	19	47.5
	G3	37	28.9	12	30.0
Lymph node metastasis	Median	0		0		0.329
	Range	0–14		0–14
14-3-3σ	Median	4		4		0.953
	Range	0–12		0–12
T-stage	T1+T2	23	18.0	9	22.5	0.527
	T3+T4	105	82.0	31	77.5
Survival	Median	29		32		0.798
	Range	0–61		2–61