Establishment and Validation for Predicting the Lymph Node Metastasis in Early Gastric Adenocarcinoma

Table 5

The performance of the logistic regression prediction model.

Parameter (95% CI)	SEER data		External validation
	Training set	Test set
AUC	0.731 (0.682–0.779)	0.766 (0.709–0.823)	0.625 (0.573–0.678)
Accuracy	0.588 (0.544–0.631)	0.588 (0.533–0.641)	0.617 (0.573–0.660)
Sensitivity	0.850 (0.769–0.912)	0.899 (0.802–0.958)	0.391 (0.308–0.479)
Specificity	0.518 (0.467–0.568)	0.507 (0.446–0.569)	0.701 (0.651–0.748)
PPV	0.322 (0.267–0.379)	0.320 (0.255–0.390)	0.325 (0.253–0.403)
NPV	0.928 (0.886–0.958)	0.951 (0.902–0.980)	0.757 (0.708–0.802)
Cutoff	0.1607	0.1607	0.1607

Note: AUC: the area under the receiver operating characteristic curve; PPV: positive predictive value; NPV: negative predictive value.