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Natural history of human papillomavirus (HPV) infection (clearance, persistence, or sequential infection) in women who tested HPV positive at baseline
| Age at baseline (years) | Number tested | Total clearance No. (%) | Sequential infection No. (%) | Persistent infection No. (%) |
| <21 | 27 | 10 (37.0) | 12 (44.4) | 5 (18.5) |
| 21–30 | 36 | 12 (33.3) | 13 (36.1) | 11 (30.6) |
| 31–45 | 39 | 20 (51.3) | 10 (25.6) | 9 (23.1) |
| >45 | 21 | 14 (66.7) | 3 (14.3) | 4 (19.0) |
