Table 5. Incidence and hazard ratio of colorectal cancer during post appendectomy follow-up.

Variable	Appendectomy cohort		Comparison cohort
	Event no.	Incidence†	Event no.	Incidence†	HR (95% CI)
Post appendectomy follow-up years
1.5–6.5	162	4.36	444	3.00	1.45 (1.21–1.74)***
> 6.5	213	4.34	859	4.43	0.98 (0.84–1.14)
Post appendectomy follow-up < 6.5 years
1.5–3.5	83	5.52	156	2.60	2.13 (1.63–2.77)***
3.5–6.5	79	3.58	288	3.28	1.09 (0.85–1.40)

† per 10000 person-years

* p<0.05

** p<0.01

*** p<0.0001