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

Table 6 Model calibration and clinical net benefit assessment

Assessment indicator	Multiphase combined model	Venous phase model	Arterial phase model	Delayed phase model
SMOTE-processed training set (n = 178)
H-L test χ2	5.842	8.726	11.245	9.324
H-L test P value	0.664	0.365	0.187	0.316
Calibration curve slope	0.94	0.89	0.85	0.87
Calibration curve intercept	0.08	0.12	0.18	0.15
Validation set (n = 60)
H-L test χ2	4.926	6.542	8.734	7.658
H-L test P value	0.765	0.587	0.365	0.468
Calibration curve slope	0.91	0.86	0.82	0.84
Calibration curve intercept	0.11	0.16	0.21	0.19
Clinical net benefit
Net benefit at threshold probability 0.25	0.224	0.192	0.158	0.176
Avoidable unnecessary surgeries (%)	33.7	28.5	23.2	25.6

SMOTE: Synthetic minority oversampling technique.