|  | 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% |