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

Table 5 Incidence of colorectal cancer and advanced polyps by post polypectomy surveillance interval and risk group

Interval	n (N = 2875)	Follow-up time (patient-years)	CRC and advanced polyp cases	Incidence rate (cases per 1000 person-years)	Incidence proportion (%)	OR1	95%CI1	P value1
High-risk (3-year interval) group
Total	1678	4555.09	273	59.93	16.27
Early	929	1131.04	143	126.43	15.39	Reference
Usual	198	590.94	34	57.54	17.17	1.14	0.76-1.72	0.532
Late	551	2833.11	96	33.89	17.42	1.16	0.87-1.54	0.305
Late vs usual						1.02	0.66-1.56	0.936
Low-risk (5-year interval) group
Total	1197	5261.89	87	16.53	7.27
Early	622	1601.17	35	21.86	5.63	Reference
Usual	139	687.37	10	14.55	7.19	1.30	0.63-2.69	0.480
Late	436	2973.35	42	14.13	9.63	1.79	1.12-2.85	0.015
Late vs usual						1.38	0.67-2.82	0.384

¹Univariable logistic regression. The early surveillance group served as the reference category unless otherwise specified (late vs usual comparison is also shown). Follow-up time is measured in patient-years.

CI: Confidence interval; CRC: Colorectal cancer; N: Total number of patients; n: Number of patients per subgroup; OR: Odds ratio.