Preoperative prediction of lymphovascular and perineural invasion in gastric cancer using spectral computed tomography imaging and machine learning

Table 2 Risk factors of lymphovascular invasion and perineural invasion in gastric cancer

Variables	Feature selection		Individual nomogram
	BestFirst with probability (%)	InfoGainAttributeEval with average merit	Z value	OR (95%CI)	P value
CT-EMVI	100	0.203 ± 0.016	2.451	3.396 (1.277-9.027)	0.014
CT-T	100	0.263 ± 0.018	2.177	2.683 (1.103-6.523)	0.029
VP-70kev	90	0.356 ± 0.016	3.565	1.047 (1.021-1.074)	< 0.001
EP-NIC	90	0.239 ± 0.016	2.934	117.723 (4.867-2847.564)	0.003
CT-N	100	0.197 ± 0.014

CT-EMVI: Computed tomography-detected extramural vein invasion; VP-70 keV: Single-energy computed tomography value of 70 keV in the venous phase; EP-NIC: Ratio of the standardized iodine concentration in the equilibrium phase; OR: Odds ratio; CI: Confidence interval.