Table 1.
Characteristics of individuals diagnosed with incident colorectal adenomas in Northern Ireland 2000–05.
| Variable | Adenoma a register n= 6,972 (%)b |
|---|---|
| Sex | |
| Female | 3,157 (45.3) |
| Male | 3,815 (54.7) |
| Age at diagnosis (years, mean ± SD) | 62.7 ± 13.1 |
| Age groups at diagnosis (years) | |
| 16–<50 | 1,237 (17.7) |
| 50–<60 | 1,609 (23.1) |
| 60–<70 | 1,916 (27.5) |
| 70–<80 | 1,613 (23.1) |
| ≥80 | 597 (8.6) |
| Year of diagnosis | |
| 2000 | 1,004 (14.4) |
| 2001 | 990 (14.2) |
| 2002 | 1,016 (14.6) |
| 2003 | 1,280 (18.4) |
| 2004 | 1,278 (18.3) |
| 2005 | 1,404 (20.1) |
| Topography of index polyp(s) | |
| Colon only | 4,815 (69.1) |
| Rectum only | 1,687 (24.2) |
| Colon & rectum | 470 (6.7) |
| Number of incident polyps a | |
| 1 | 5,414 (77.7) |
| ≥2 | 1,558 (22.4) |
| Adenoma histology c | |
| Tubular only | 1,771 (25.4) |
| Villous/tubulovillous | 3,368 (48.3) |
| Unspecified | 1,833 (26.3) |
| Advanced adenomas d | 3,819 (54.8) |
| Subsequent adenoma e | 870 (12.5) |
| Subsequent hyperplastic polyp e | 447 (6.4) |
Incorporates n=858 individuals diagnosed with concurrent hyperplastic polyps as outlined in Figure 1. These are excluded from the ≥2 polyp number category unless multiple adenomas were diagnosed.
Percentages may not total 100 due to rounding.
Individuals with ≥1 villous or tubulovillous adenoma were classified as villous/tubulovillous, even if they also had a tubular adenoma at incident diagnosis.
Individuals with multiple adenomas or ≥1 villous/tubulovillous adenomas were classified as advanced. The polyp register did not contain detailed information on polyp size.
Subsequent defined as ever diagnosis ≥6 months after incident polyps and up to date of colorectal cancer diagnosis or end of 31st December 2005.