Table 4.

The area under curve (AUC) for predicting BMs.

Variables	The training group			The validation group
	AUC	SE	95% CI	AUC	SE	95% CI
Grade	0.752	0.00404	0.748–0.756	0.686	0.0305	0.654–0.717
Histology	0.558	0.00568	0.553–0.563	0.541	0.0341	0.507–0.575
T stage	0.741	0.00528	0.737–0.745	0.628	0.0334	0.595–0.660
N stage	0.681	0.00519	0.677–0.686	0.598	0.0286	0.564–0.631
Liver metastasis	0.611	0.00446	0.607–0.616	0.601	0.0258	0.567–0.634
Nomogram	0.952	0.00210	0.950–0.954	0.836	0.0239	0.809–0.860

SE, standard error; 95% CI, 95%, confidence interval.