Table 1. Six previously reported single nucleotide polymorphisms associated with ankylosing spondylitis.

SNP	Population	Chr.a position	Candidate gene	No. Sample (Case/Control)	Trend p value	Ref.b
rs27434	Han Chinese	5p15	ERAP1	1,837/4,231	6.68E-4	9
rs3734523	European	6p22.2	MHC	2,053/5,140	1.60E-8	7
rs4672495	European	2p15	-	2,053/5,140	3.30E-9	7
rs10865331	Han Chinese	2p15	-	1,837/4,231	1.98E-8	9
rs11209032	British, Australian	1p31	IL23R	4,810/13,579	2.3E-17	8
rs13210693	Han Chinese	6q21	-	1,837/4,231	9.31E-7	9

^a. Chr., Chromosome.

^b. Reference number (Ref.) is the same as that in the text.