Using the K-Nearest Neighbor Algorithm for the Classification of Lymph Node Metastasis in Gastric Cancer

Table 3

Univariate analyses of the features of gastric lymph node metastasis venous phase.

No.	Feature	Mean ± Standard		𝑃1	𝑃2	𝑟pb	AUC	SU	IG
		Negative	Positive
19	40 keV	168.56±45.67	199.95±51.33	0.000	0.087	0.282	0.684	0.070	0.072
20	50 keV	117.94±29.61	137.13±32.85	0.000	0.102	0.269	0.673	0.070	0.072
21	60 keV	86.91±20.03	98.71±22.14	0.000	0.135	0.247	0.653	0.086	0.092
22	70 keV	67.54±13.52	73.94±14.14	0.000	0.209	0.209	0.620	0.106	0.104
23	80 keV	55.09±11.10	57.96±11.31	0.000	0.481	0.118	0.559	0.110	0.122
24	90 keV	46.76±10.95	47.02±11.50	0.000	0.949	0.011	0.535	0.018	0.018
25	100 keV	41.08±11.04	39.90±12.06	0.000	0.781	−0.047	0.562	0.018	0.020
26	110 keV	37.08±11.29	34.81±12.73	0.003	0.611	−0.085	0.599	0.011	0.011
27	120 keV	34.25±11.56	31.27±13.30	0.012	0.521	−0.107	0.613	0.011	0.011
28	130 keV	32.10±11.86	28.56±13.79	0.028	0.461	−0.123	0.613	0.011	0.011
29	140 keV	30.37±12.09	26.42±14.19	0.052	0.423	−0.134	0.626	0.018	0.019
30	Effective-Z	8.61±0.38	8.87±0.42	0.000	0.081	0.286	0.680	0.087	0.088
31	Calcium-Iodine	812.48±9.36	807.83±11.88	0.651	0.254	−0.190	0.643	0.025	0.026
32	Calcium-Water	24.65±9.57	31.44±11.52	0.000	0.093	0.276	0.673	0.086	0.087
33	Iodine-Calcium	−570.78±8.89	−565.23±11.43	0.005	0.159	0.233	0.650	0.037	0.042
34	Iodine-Water	17.56±6.43	22.25±7.71	0.000	0.084	0.284	0.667	0.074	0.073
35	Water-Calcium	1005.60±17.73	994.85±22.22	0.011	0.162	−0.231	0.657	0.037	0.042
36	Water-Iodine	1021.14±13.95	1014.62±17.03	0.631	0.270	−0.184	0.636	0.011	0.011