Table 3.
Summary of other worldwide studies concerning pterygium.
| Country | Age | Pterygium (%) |
|---|---|---|
| Spain15 | >40 | 5.9 |
| China16 | >30 | 11.95 |
| Saudi Arabia17 | 17–82 | 0.074 |
| Singapore18 | >40 | 10.1 |
| India13 | >40 | 9.5 |
| Singapore19 | 40–79 | 12.3 |
| Tunisia20 | Not available | 2.4 |
| Australia21 | Not available | 19.6 |
| Iran11 | Not available | 1.3 |
| Indonesia22 | >21 | 10.0 |
| China (rural)23 | >50 | 10.53 |
| Australia24 | >20 | 9.3 |
| China (rural)25 | >50 | 6.4 |
| China (rural)26 | 55–85 | 3.76 |
| China27 | >40 | 17.9 |
| China28 | >40 | 14.49 |
| China29 | >40 | 2.9 |
| Nepal30 | >16 | 10.08 |
| India31 | >30 | 11.7 |
| Australia14 | >40 | 1.2 |
| India32 | >30 | 8.47 |
| Blue mountain8 | >49 | 7.3 |
| Iran10 | 40–64 | 9.4 |
| Japan9 | >40 | 13.1 |
| China (rural)33 | >30 | 6.0 |
| Japan34 | 40–74 | 4.4 |
| China (rural)7 | ≥50 | 39.0 |
| Greenland35 | Not available | 8.6 |
| Denmark35 | Not available | 0.7 |
| China (rural)6 | 18–94 | 1.2 |
| Global world (meta-analysis)36 | Not available | 10.2 |