Volume 11, Number 11—November 2005
Research
Cervical Human Papillomavirus Screening among Older Women
Table 3
Numbers of women infected with human papillomavirus (HPV) 16 and 18 at baseline and follow-up and HPV16 and HPV18 acquisition and clearance rates by age
| Age (y, baseline) | HPV status – (1988) |
HPV status + (1988) |
% HPV acquisition in 3 y (95% CI) | % HPV clearance in 3 y (95% CI)* | ||
|---|---|---|---|---|---|---|
| – (1991) | + (1991) | – (1991) | + (1991) | |||
| HPV16 | ||||||
| 21 | 79 | 3 | 3 | 1 | 3.7 (1.3–10.2) | – |
| 31 | 94 | 3 | 1 | 0 | 3.1 (1.1–8.7) | – |
| 41 | 94 | 3 | 3 | 0 | 3.1 (1.1–8.7) | – |
| 51 | 360 | 11 | 1 | 0 | 3.0 (1.7–5.2) | – |
| Total | 627 | 20 | 8 | 1 | 3.1 (2.0–4.7) | 88.9 (56.5–98.0) |
| HPV18 | ||||||
| 21 | 77 | 2 | 6 | 1 | 2.5 (0.7–8.8) | – |
| 31 | 89 | 5 | 3 | 1 | 5.3 (2.3–11.9) | – |
| 41 | 95 | 3 | 2 | 0 | 3.1 (1.0–8.6) | – |
| 51 | 352 | 14 | 5 | 0 | 3.8 (2.3–6.3) | – |
| Total | 613 | 24 | 16 | 2 | 3.8 (2.5–5.5) | 88.9 (67.1–96.9) |
*Clearance rates of HPV 16/18 were not calculated for individual ages because of insufficient numbers; CI, confidence interval.
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