Table 2.

Comparison of clinical-radiological features between training and validation Cohorts

Group	Number	Clinical stage		Tumor diameter		MR-reported LN status
		IB	IIA	≤4 cm	＞4 cm	LN-negative	LN-positive
Training cohort	102	71	31	63	39	86	16
Validation cohort	51	39	12	38	13	40	11
X2		0.792		2.462		0.810
p		0.373		0.117		0.368

LN, lymph node; X2, chi-square value.