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

Table 4 Incidence of colorectal cancer by post polypectomy surveillance interval and risk group

Interval	n (N = 2875)	Follow-up time (patient-years)	CRC cases	Incidence rate (cases per 1000 patient-years)	Incidence proportion (%)	OR1	95%CI1	P value1
High-risk (3-year interval) group
Total	1678	4555.09	14	3.07	0.83
Early	929	1131.04	5	4.42	0.54	Reference
Usual	198	590.94	1	1.69	0.51	0.94	0.11-8.07	0.954
Late	551	2833.11	8	2.82	1.45	2.72	0.89-8.36	0.080
Low-risk (5-year interval) group
Total	1197	5261.89	6	1.14	0.50
Early	622	1601.17	1	0.62	0.16	Reference
Usual	139	687.37	0	0.00	0	N/A	N/A	N/A
Late	436	2973.35	5	1.68	1.15	7.20	0.84-61.88	0.072

¹Univariable logistic regression. The early surveillance group served as the reference category. 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; N/A: Not applicable; OR: Odds ratio.