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

Table 2 Baseline characteristics of low-risk patients by surveillance interval, N = 1197

	Early		Usual		Late		P value1
	n = 622	%	n = 139	%	n = 436	%
Sex							0.255
Women	350	56.3	73	52.5	261	59.9
Men	272	43.7	66	47.5	175	40.1
Age in years at baseline
mean (SD)	62.5 (10.5)		61.5 (7.9)		61.6 (9.1)		< 0.001
< 50	60	9.7	10	7.2	47	10.8	0.033
50-75	492	79.1	123	88.5	356	81.6
> 75	70	11.2	6	4.3	33	7.6
Number of polyps							N/A
1-2	622	100	139	100	436	100
Size of polyps in mm							N/A
< 10	622	100	139	100	436	100
Adenoma histology							N/A
Tubular	622	100	139	100	436	100
Adenoma dysplasia grade							N/A
No/low-to-intermediate	622	100	139	100	436	100

¹Continuous variables were compared using one-way analysis of variance; categorical variables were compared using the Fisher exact test. Data are presented as n (%) unless otherwise specified. All low-risk patients had 1-2 polyps < 10 mm, tubular adenoma histology, and no/low-to-intermediate dysplasia; therefore, polyp characteristics are uniform across intervals.

N: Total number of patients; n: Number of patients per subgroup; N/A: Not applicable.