Table 3.

Incidence and recurrence rates of colorectal neoplasia—advanced lesions

	No of subjects	Advanced lesion	Mean time (y)	Annual incidence rate (%/year)	Hazard ratio	95% CI	p Value
Total	6225	90	3.44	0.42
Sex
Female	1566	19	3.02	0.40	1
Male	4659	71	3.59	0.42	0.9	0.5–1.5	0.9
Age (y)*
<40	806	3	3.56	0.10	1
40–49	2738	29	3.61	0.29	2.3	0.7–7.6	0.17
50–59	1975	36	3.24	0.56	3.6	1.1–12	0.04
⩾60	706	22	3.22	0.97	5.5	1.6–19	<0.01
Initial lesion
None	4084	30	3.45	0.21	1
Small adenoma	1818	40	3.46	0.64	2.6	1.6–4.2	<0.001
Advanced lesion	323	20	3.29	1.88	6.6	3.7–12	<0.001

*Age groups were classified according to age at the second colonoscopy.