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

Table 1 Baseline patient and polyp characteristics by risk group

	High-risk (3-year interval)		Low-risk (5-year interval)		P value1
	N = 1678	%	N = 1197	%
Sex					< 0.001
Women	822	49	684	57.1
Men	856	51	513	42.9
Age in years at baseline
mean (SD)	64.8 (9.5)	N/A	62.0 (9.7)	N/A	< 0.001
< 50	92	5.5	117	9.8	< 0.001
50-75	1328	76.1	971	81.1
> 75	258	15.4	109	9.1
Number of polyps					N/A
1-2	556	33.1	1197	100
3-4	636	37.9	0	0
5-10	273	16.3	0	0
> 10	213	12.7	0	0
Size of polyps in mm					N/A
< 10	637	39.5	1046	100
10-19	636	39.5	0	0
≥ 20	339	21	0	0
Adenoma histology					N/A
Tubular	1252	74.6	1197	100
Tubulovillous	2	0.1	0	0
Villous	45	2.7	0	0
Traditional serrated	379	22.6	0	0
Adenoma dysplasia grade					N/A
No/low-to-intermediate	1348	80.3	1196	100
High	330	19.7	0	0

¹Continuous variables were compared using the independent t test; categorical variables were compared using the Fisher exact test. Data are presented as n (%) unless otherwise specified.

N: Total number of patients; N/A: Not applicable.