Incidence of colorectal cancer and advanced polyps by post-polypectomy surveillance interval: Real-world evidence from Thailand

Table 3 Baseline characteristics of high-risk patients by surveillance interval, N = 1678

	Early		Usual		Late		P value1
	n = 849	%	n = 201	%	n = 551	%
Sex							0.337
Women	431	50.8	95	47.3	296	47.1
Men	418	49.2	106	52.7	332	52.9
Age in years at baseline
mean (SD)	64.9 (10.2)		65.6 (8.7)		64.3 (8.7)		< 0.001
< 50	52	5.6	6	3	34	6.2	0.001
50-75	708	76.2	162	81.8	458	83.1
> 75	169	18.2	30	15.2	59	10.7
Number of polyps
1-2	373	40.1	54	27.3	129	23.4	< 0.001
3-4	301	32.4	74	37.3	261	47.4
5-9	140	15.1	34	17.2	99	18
≥ 10	115	12.4	36	18.2	62	11.2
Size of polyps in mm							< 0.001
< 10	247	27.9	82	42.3	308	57.9
10-19	361	40.7	90	46.4	185	34.8
≥ 20	278	31.4	22	11.3	39	7.3
Adenoma histology							< 0.001
Tubular	617	66.4	164	82.8	471	85.5
Tubulovillous	1	0.1	0	0	1	0.2
Villous	31	3.4	1	0.5	13	2.3
Traditional serrated	280	30.1	33	16.7	66	12
Adenoma dysplasia grade							< 0.001
No/low-to-intermediate	645	69.4	184	92.9	519	94.2
High	284	30.6	14	7.1	32	5.8

¹Continuous variables were compared using 1-way analysis of variance; categorical variables were compared using the Fisher exact test. Data are presented as n (%) unless otherwise specified.

N: Total number of patients; n: Number of patients per subgroup.