A CT-Based Radiomics Nomogram Model for Differentiating Primary Malignant Melanoma of the Esophagus from Esophageal Squamous Cell Carcinoma

Table 1

Characteristics of patients in primary and validation cohorts.

Characteristics	Primary cohort ()	Validation cohort ()	or	value
Age (years)			0.218	0.828
Gender, (%)			0.113	0.737
Male	61 (75.3%)	32 (78.0%)
Female	20 (24.7%)	9 (22.0%)
Pathology, (%)			0.035	0.852
ESCC	62 (76.5%)	32 (78.0%)
PMME	19 (23.5%)	9 (22.0%)
Location, (%)			3.122	0.373
Neck	2 (2.5%)	2 (4.9%)
Upper-thorax	9 (11.1%)	8 (19.5%)
Mid-thorax	32 (39.5%)	11 (26.8%)
Low-thorax	38 (46.9%)	20 (48.8%)

ESCC: esophageal squamous cell carcinoma; : number; PMME: primary malignant melanoma of the esophagus. Numbers of patients presented as (%). Data in parentheses are percentage of patients.