Prevalence and Risk Factors for Pterygium in Rural Older Adults in Shandong Province of China: A Cross-Sectional Study

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)	0.00^a
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)	0.53^b
Female	10013 (56.20)	1067	10.66 (10.06–11.26)
Area
Rushan	4994 (28.03)	558	11.17 (10.30–12.04)	0.01^c
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)

^a𝑃 value between different age groups by 𝜒² test.
^b𝑃 value between male and female by 𝜒² test.
^c𝑃 value of comparison between four examination sites by 𝜒² test.