Table 1

Incidence and recurrence rates of colorectal neoplasia—all neoplasias

	No of subjects	All neoplasias	Mean time (y)	Annual incidence rate (%/year)	Hazard ratio	95% CI	p Value
*Age groups were classified according to age at the second colonoscopy.
Total	6225	1831	2.69	10.9
Sex
Female	1566	266	2.62	6.5	1
Male	4659	1565	2.71	12.4	1.8	1.6–2.0	<0.001
Age (y)*
<40	806	151	3.07	6.1	1
40–49	2738	754	2.84	9.7	1.5	1.3–1.8	<0.001
50–59	1975	656	2.46	13.5	2.0	1.6–2.3	<0.001
⩾60	706	270	2.35	16.3	2.2	1.8–2.7	<0.001
Initial lesion
None	4084	848	2.89	7.2	1
Small adenoma	1818	821	2.34	19.3	2.4	2.2–2.7	<0.001
Advanced lesion	323	162	2.19	22.9	2.6	2.2–3.1	<0.001