Table 5.

Prevalence of rheumatoid arthritis in China

Site of survey [ref.]	Location	Age (Years)	Ethnic	Time	Number	Prevalence (%)
Taiwan [4]	Rural island	≥17	Han	1974	5,629	0.3
Beijing [9]	Rural	≥20	Han	1987	4,192	0.34
Taiyuan [41]	Urban	≥16	Han	2004	3,915	0.28
Shandong [25]	Rural	≥16	Han	1996	5,055	0.36
Shanghai [3]	Urban	≥16	Han	1992	2,010	0.2
Shanghai [28]	Urban	≥16	Han	1998	6,584	0.28
Hong Kong [18]	Urban	≥16	Han	1992	1,988	0.35
Shantou [9]	Rural	≥20	Han	1987	5,058	0.32
Shantou [23]	Urban	≥16	Han	1995	2,040	0.2
Taiwan [19]	Urban	≥20	Han	1994	3,000	0.93
Taiwan [19]	Suburban	≥20	Han	1994	3,000	0.78
Taiwan [19]	Rural	≥20	Han	1994	2,998	0.26
Heilongjiang [12]	Mountain	≥18	H and Maa	1989	2,311	0.50
Changchun [6]	Factory	≥20	H and Maa	1980	36,097	0.32
Ningxia [14]	Highland	≥18	H and Mub	1990	10,420	0.36

^aHan and Manchu. ^bHan and Muslin.