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Table 4
Prevalence of spondyloarthropathy in China
Site of survey [ref.]	Location	Age (Years)	Ethnic	Time	Number	Prevalence (%)

						AS	PsA	ReA	uSpA

Taiwan [4]	Island	≥17	Han	1974	5,629	0.2
Beijing [9]	Rural	≥20	Han	1987	4,192	0.26
Beijing [31]	Urban	≥16	Han	1999	1,982	0.3	0.10		1.21
Taiyuan [40]	Urban	≥16	Han	2004	3,915	0.2	0.05		0.64
Shandong [25]	Rural	≥16	Han	1996	5,055	0.22	0.04	0.02
Shanghai [3]	Urban	≥16	Han	1992	2,010	0.20
Taiwan [19]	Urban	≥20	Han	1992	3,000	0.4
Taiwan [19]	Suburban	≥20	Han	1992	3,000	0.19
Taiwan [19]	Rural	≥20	Han	1992	2,998	0.54
Shantou [8]	Rural	≥16	Han	1985	10,647	0.20
Shantou [9]	Rural	≥20	Han	1987	5,058	0.26
Shantou [23]	Urban	≥16	Han	1995	2,040	0.2
Shantou [30]	Suburban	≥16	Han	1999	2,029	0.3	0.05		1.0
Military [35]	15 provinces	17 to 40^a	11 ethnics	2000	20,068	0.24
Heilongjiang [12]	Mountain	≥18	H and Ma^c	1989	2,311	0.09
Changchun [6]	Factory	≥20^b	H and Ma^c	1980	36,097	0.06	0.01
Ningxia [14]	Highland	≥18	H and Mu^d	1990	10,420	0.10

^aAll male. ^bMale > female. ^cHan and Manchu. ^dHan and Muslin. AS, ankylosing spondylitis; PsA, psoriatic arthritis; ReA, reactive arthritis; uSpA, undifferentiated spondyloarthropathy.
Zeng et al. Arthritis Research & Therapy 2008 10:R17 doi:10.1186/ar2368

Table 4