Table 3.

Number of LNs and total volume of all LNs between the positive and negative LN metastasis groups

Variables	Positive LN metastasis	Negative LN metastasis	P-value
Number of LNs
Training cohort	5.5 ± 2.8	6.4 ± 2.5	0.0417*
Validation cohort	4.8 ± 2.6	4.5 ± 2.4	0.7439
Total volume of all LNs
Training cohort (mm3)	1246 ± 618	1108 ± 528	0.0027*
Validation cohort (mm3)	945 ± 817	706 ± 528	0.0028*

Data are expressed as mean ± standard deviation. *indicates statistical significance. LN, lymph node.