Constructing a nomogram to predict overall survival of colon cancer based on computed tomography characteristics and clinicopathological factors

Table 1 Computed tomography imaging characteristics and clinicopathological characteristics of the training and testing sets of colon cancer patients

Variable	Overall (n = 249)		Train (n = 125)		Test (n = 124)
	n	%	n	%	n	%
Sex
Female	153	61.4	77	61.6	76	61.3
Male	96	38.6	48	38.4	48	38.7
Age (years)
≤ 35	11	4.4	6	4.8	5	4.0
36-59	105	42.2	50	42.4	52	41.9
60-74	107	43.0	53	40.0	57	46.0
≥ 75	26	10.4	16	12.8	10	8.1
Tumor_location
Ascending colon	108	43.4	59	47.2	49	39.5
Transverse colon	20	8.0	10	8.0	10	8.1
Descending colon	32	12.9	11	8.8	21	16.9
Sigmoid colon	89	35.7	45	36.0	44	35.5
rT
T1	4	1.6	3	2.4	1	0.8
T2	18	7.2	11	8.8	7	5.6
T3	107	43.0	52	41.6	55	44.4
T4	120	48.2	59	47.2	61	49.2
ctLNM
(-)	173	69.5	86	68.8	87	70.2
(+)	76	30.5	39	31.2	37	29.8
ctEMVI
(-)	142	57.0	70	56.0	72	58.1
(+)	107	43.0	55	44.0	52	41.9
pT
T1	9	3.6	4	3.2	5	4.0
T2	16	6.4	9	7.2	7	5.6
T3	177	71.1	85	68.0	92	74.2
T4	47	18.9	27	21.6	20	16.1
pN
N0	142	57.0	74	59.2	68	54.8
N1	74	29.7	34	27.2	40	32.3
N2	33	13.3	17	13.6	16	12.9
MLN-number
0	156	62.7	83	66.4	973	58.9
1-3	60	24.1	25	20.0	35	28.2
4-6	13	5.2	6	4.8	7	5.6
≥ 7	20	8.0	11	8.8	9	7.3
MLN_partition
No MLN	156	62.7	83	66.4	73	58.9
N1	5	2.0	2	1.6	3	2.4
N2	81	32.5	36	28.8	45	36.3
N3	7	2.8	4	3.2	3	2.4
LVI
(-)	166	66.7	83	66.4	83	66.9
(+)	83	33.3	42	33.6	41	33.1
Vessel
(-)	160	64.3	80	64.0	80	64.5
(+)	89	35.7	45	36.0	44	35.5
Perineural
(-)	203	81.5	101	80.8	102	82.3
(+)	46	18.5	24	19.2	22	17.7
Tumor classification
Mucinous carcinoma	25	10.0	18	14.4	7	5.6
Poorly differentiated adenocarcinoma	33	13.3	18	14.4	15	12.1
Moderately differentiated adenocarcinoma	174	69.9	80	64.0	94	75.8
Well-differentiated adenocarcinoma	17	6.8	9	7.2	8	6.5

rT: Imaging T staging; pT, pN: Pathological T, N staging; MLN_partition: Lymph node metastasis area on computed tomography scan; MLN-number: Number of lymph node metastases on pathology; ctLNM: Whether lymph nodes are metastatic on imaging; ctEMVI: Detection of extramural venous invasion on computed tomography scan; LVI: Lymphovascular invasion.