Table 2.
Selected characteristics of the 34 studies
| N | % | ||
|---|---|---|---|
| Confounding factors | Age | 22 | 64.71% |
| Gender | 24 | 70.59% | |
| Smoking | 15 | 44.12% | |
| Alcohol | 15 | 44.12% | |
| Study type | Case-control | 6 | 17.65% |
| Nested Case Control | 1 | 2.94% | |
| Multi-Center Case Control | 1 | 2.94% | |
| Case Series | 3 | 8.82% | |
| Retrospective | 20 | 58.82% | |
| Prospective | 3 | 8.82% | |
| Sample size | < 50 | 5 | 14.71% |
| (No. of patients) | 50-99 | 14 | 41.18% |
| 100-149 | 7 | 20.59% | |
| >150 | 8 | 23.53% | |
| Prevalence HPV | < 25% | 14 | 41.18% |
| 25%-50% | 14 | 41.18% | |
| 50%-75% | 5 | 14.71% | |
| >75% | 1 | 2.94% | |
| Prevalence HPV-16 | < 25% | 16 | 47.06% |
| 25%-50% | 13 | 38.24% | |
| 50%-75% | 4 | 11.76% | |
| >75% | 1 | 2.94% | |
| Method of Detection | PCR | 33 | 97.06% |
| FISH | 1 | 2.94% | |
| Country | USA | 14 | 41.18% |
| Canada | 1 | 2.94% | |
| Puerto Rico | 1 | 2.94% | |
| France | 2 | 5.88% | |
| Germany | 4 | 11.76% | |
| Netherlands | 2 | 5.88% | |
| Italy | 3 | 8.82% | |
| Switzerland | 1 | 2.94% | |
| Norway, Finland, Sweden | 1 | 2.94% | |
| Sweden | 3 | 8.82% | |
| Japan | 1 | 2.94% | |
| International | 1 | 2.94% | |