Table 2.
Prevalence of pterygium in participants by age, gender, and examination site.
| Participants number (%) | Pterygium number | Pterygium prevalence (%) (95% CI) | P value | |
|---|---|---|---|---|
| Age (years) | ||||
| 50–59 | 8423 (47.28) | 732 | 8.69 (8.09–9.29) | 0.00a |
| 60–69 | 5187 (29.12) | 607 | 11.70 (10.83–12.57) | |
| 70–79 | 3165 (17.76) | 415 | 13.11 (11.93–14.29) | |
| ≥80 | 1041 (5.84) | 122 | 11.72 (9.77–13.67) | |
| Gender | ||||
| Male | 7803 (43.80) | 809 | 10.37 (9.69–11.05) | 0.53b |
| Female | 10013 (56.20) | 1067 | 10.66 (10.06–11.26) | |
| Area | ||||
| Rushan | 4994 (28.03) | 558 | 11.17 (10.30–12.04) | 0.01c |
| Huaiyin | 3040 (17.07) | 341 | 11.22 (10.10–12.34) | |
| Tengzhou | 4916 (27.59) | 522 | 10.62 (9.76–11.48) | |
| Juancheng | 4866 (27.31) | 455 | 9.35 (8.53–10.17) | |
| Total | 17816 (100.00) | 1876 | 10.53 (10.08–10.98) |
a P value between different age groups by χ 2 test.
b P value between male and female by χ 2 test.
c P value of comparison between four examination sites by χ 2 test.