Magnetic resonance imaging-radiomics evaluation of response to chemotherapy for synchronous liver metastasis of colorectal cancer

Table 2 The area under the curve of radiomics model of DWI sequence, radiomics model of T2WI sequence, and radiomics model of portal phase of contrast-enhanced sequences models in the training set and the validation set

Sequence	Training set	P value	Validation set	P value
Ra-DWI	0.652 (95%CI, 0.571-0.726)	0.001	0.661 (95%CI, 0.536-0.772)	0.018
Ra-T2WI	0.628 (95%CI, 0.547-0.704)	0.005	0.575 (95%CI, 0.450-0.695)	0.291
Ra-CEPP	0.633 (95%CI, 0.552-0.709)	0.003	0.543 (95%CI, 0.418-0.664)	0.544

A P < 0.05 of the DeLong test was considered statistically significant. The DeLong test of validation set in radiomics model of T2WI sequence and radiomics model of portal phase of contrast-enhanced sequences had no statistical significance. Ra-DWI: Radiomics model of DWI sequence; Ra-T2WI: Radiomics model of T2WI sequence; Ra-CE_PP: Radiomics model of portal phase of contrast-enhanced sequences; CI: Confidence interval.