Table 3.
Trends in anal cancer incidence in the general population during 1980–2005
| Category | Annual percent change*, (95% CI), based on all anal cancer cases | Annual percent change* (95% CI), with exclusion of HIV-infected anal cancer cases |
|---|---|---|
| Females | ||
| Total† | 3.3 (3.0 to 3.7) | 3.3 (2.9 to 3.6) |
| 20–49 y | 4.5 (3.8 to 5.3) | 4.3 (3.6 to 5.1) |
| 50–69 y | 3.6 (3.0 to 4.1) | 3.5 (3.0 to 4.0) |
| >70 y | 2.4 (1.8 to 2.9) | 2.4 (1.8 to 2.9) |
| Males | ||
| Total† | 3.4 (2.9 to 3.9) | 1.7 (1.2 to 2.3) |
| 20–49 y | 5.2 (4.2 to 6.2) | 0.7 (−0.4 to 1.7) |
| 50–69 y | 3.1 (2.5 to 3.7) | 2.0 (1.3 to 2.7) |
| >70 y | 2.2 (1.6 to 2.8) | 2.1 (1.5 to 2.7) |
| White | 3.4 (2.8 to 3.9) | 2.0 (1.5 to 2.6) |
| Black | 4.3 (3.2 to 5.4) | −0.6 (−2.0 to 0.8) |
* Annual percent changes in anal cancer incidence rates were estimated using Joinpoint software. CI = confidence interval.
† Results are not presented for those aged 0–19 years because there were too few anal cancer cases (n = 8) in this age group to assess trends over time. However, this age group is included in the total and race-specific incidence rates. Results are presented stratified by race for males only, because HIV-infected anal cancer cases had little impact on anal cancer incidence rates in females.