Application value of multiphase contrast-enhanced computed tomography radiomics in preoperative evaluation of peritoneal metastasis in gastric cancer

Table 2 Dataset division and feature consistency assessment

Item	Training set (n = 140)	Validation set (n = 60)	Statistical value	P value
Peritoneal metastasis	51 (36.4)	21 (35.0)	χ2 = 0.038	0.845
Age (years)	63 (54, 71)	64 (56, 72)	Z = -0.687	0.492
Gender (male)	94 (67.1)	40 (66.7)	χ2 = 0.004	0.948
Features with ICC ≥ 0.75	3771/3920 (96.2)
Mean ICC (95%CI)	0.892 (0.856-0.921)
Distribution of excluded features
Shape features	2/14 (14.3)
First-order statistical features	15/54 (27.8)
Texture features	38/225 (16.9)
Filter features	94/3627 (2.6)

Data wea showed as n (%) or median (Q1, Q3). ICC: Intraclass correlation coefficient; 95%CI: 95% confidence interval.