Incidence of type-specific anal HRHPV infection in the Study of the Prevention of Anal Cancer
| HPV type | Incident cases (n) | PY | Incidence (per 100 PY) | 95% CI |
| 16 | 32 | 927.1 | 2.3 | 2.3 to 4.6 |
| 18 | 33 | 1262.7 | 2.6 | 1.9 to 3.7 |
| 31 | 25 | 1316.2 | 1.9 | 1.3 to 2.8 |
| 33 | 27 | 1337.6 | 2.0 | 1.4 to 2.9 |
| 35 | 32 | 1341.8 | 2.4 | 1.7 to 3.4 |
| 39 | 40 | 1286.9 | 3.1 | 2.3 to 4.2 |
| 45 | 55 | 1222.2 | 4.5 | 3.5 to 5.9 |
| 51 | 46 | 1227.1 | 3.7 | 2.8 to 5.0 |
| 52 | 57 | 1266.9 | 4.5 | 3.5 to 5.8 |
| 56 | 41 | 1330.7 | 3.1 | 2.3 to 4.2 |
| 58 | 43 | 1242.7 | 3.5 | 2.6 to 4.7 |
| 59 | 43 | 1259.1 | 3.4 | 2.5 to 4.6 |
| 68 | 58 | 1190.3 | 4.9 | 3.8 to 6.3 |
| Any HRHPV | 532 | 16 262.4 | 3.3 | 3.0 to 3.6 |
HRHPV, high-risk human papillomavirus; PY, person-years.