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

Table 5

The prevalence of pterygium in different regions of the world.

Country	Year	Age (yr)	Prevalence of pterygium
Beijing (aged rural population) [5]	2010	55–85	3.76%
Beijing (rural and urban areas of Beijing) [6]	2007	≥40	2.88%
Henan County, China (Mongolian population) [7]	2009	≥40	17.9%
Tibetans, China [8]	2007	≥40	14.49%
Handan, China (rural adult population) [9]	2013	≥30	6.0%
Doumen County, China [10]	2002	≥50	33.01%
Singapore (adult Malay population) [12]	2010	40–79	12.3%
Tehran, Iran [13]	2008	≥60	7.8%
Barbados (black subjects) [14]	2001	40~84	23.7%
Victoria, Australia [15]	2000	≥40	2.83%
Korea [16]	2008–2010	≥30	6.7%
South-western Japan [17]	2009	≥40	30.8%
Myanmar [18]	2008	≥40	19.6%
O Salnes, Spain [19]	2010	≥40	5.9%
Singapore [20]	2012	40–79	6.9%
South India [21]	2013	≥30	11.7%
Central India (rural population) [22]	2013	≥30	12.91%
Singapore (Malays, Indians, and Chinese) [23]	2012	≥40	10.1%
Northern Japan [24]	2013	40–74	4.4%
Latinos [25]	2009	≥40	16.2%
Indonesia [26]	2002	≥21	10.0%