Summary table of the data with the significance test results
| Subgroups | The pooled prevalence rates of pterygium (%) | p Value |
|---|---|---|
| Gender | ||
| Males | 14.5 | 0.03 |
| Females | 13.6 | |
| Unilateral or bilateral | ||
| Unilateral pterygium cases | 8 | <0.01 |
| Bilateral pterygium cases | 6.2 | |
| Area | ||
| Pterygium in China | 9.9 | 0.06 |
| Pterygium in the world | 10.2 | |
| Age group, years | ||
| 40–49 | 11 | <0.01 |
| 50–59 | 15.6 | |
| 60–69 | 20.1 | |
| Old age group, years | ||
| 60–69 | 20.1 | 0.12 |
| 70–79 | 20.2 | |
| Different parallel latitude | ||
| 0–10 | 14.8 | 0.01 |
| 10–20 | 13.4 | |
| 20–30 | 19.3 | |
| 30–40 | 5.9 | |
| 40–50 | 4.1 | |