Table 1.
Summarized characteristics of reviewed studies.
| Total | 23 Studies |
|---|---|
| Year of publication | 1985–2021 |
| Number of patients | |
| PVL | 543 |
| Developing oral cancer | 288 |
| Number of tumors | 504 |
| Sample size, range | |
| PVL | 3–81 |
| Developing oral cancer | 1–48 |
| Number of tumors | 1–130 |
| Study design | |
| Retrospective longitudinal | 23 studies |
| Prospective longitudinal | 1 studies |
| Follow up periods | |
| Mean of means | 65.63 months |
| Range | 14–174 |
| Geographical region | |
| Europe | 9 studies, 4 countries: France, Italy, Spain, UK |
| North America | 9 studies, 1 country: USA |
| Asia | 3 studies, 3 countries: India, Israel, Malaysia |
| South America | 1 study, 1 country: Brazil |
| Multicontinent | 1 study, 2 countries: Brazil-USA |
| Total | 4 continents (9 countries) |
Table S1 (Supplementary Materials, pp. 3–5) exhibits in more detail the characteristics of each study.