Table 1.

Comparison of the B*2704 and B*2705 constituent ratio between Han Chinese patients with ankylosing spondylitis (AS) and those in other areas of the world. The constituent ratios of B*2704 and B*2705 in our study population were 76/93 and 12/93, respectively. Significant differences for the distribution of B27 subtypes between patients with AS from different ethnic groups are indicated.

Report	Nation	Allele	Constituent Ratio	Comparison with Study Population
Report	Nation	Allele	Constituent Ratio	Chi-square	p
Chen¹	Taiwan	B*2704	97.83 (180/184)	22.87	< 0.001
Chen¹	Taiwan	B*2705	1.63 (3/184)	15.33	< 0.001
Lopez-Larrea²	Thailand	B*2704	91.11 (41/45)	2.07	0.15
Lopez-Larrea²	Thailand	B*2705	0	4.838	0.028
Lopez-Larrea²	India	B*2704	40 (18/45)	24.30	< 0.001
Lopez-Larrea²	India	B*2705	0	4.838	0.028
Yamaguchi³	Japan	B*2704	66.67 (14/21)	2.34	0.126
Yamaguchi³	Japan	B*2705	33.33 (7/21)	5.15	0.023
Oguz⁴	Turkey	B*2704	1.96 (1/51)	84.22	< 0.001
Oguz⁴	Turkey	B*2705	66.67 (34/51)	43.79	< 0.001
Armas⁵	Azores	B*2704	0	66.71	< 0.001
Armas⁵	Azores	B*2705	93.75 (30/32)	69.75	< 0.001
Paladini⁶	Sardinia	B*2704	0	71.61	< 0.001
Paladini⁶	Sardinia	B*2705	83.33 (30/36)	58.63	< 0.001
Paladini⁶	Italy	B*2704	0	93.41	< 0.001
Paladini⁶	Italy	B*2705	73.21 (41/56)	55.48	< 0.001
Cipriani⁷	Venezuela	B*2704	0	85.09	< 0.001
Cipriani⁷	Venezuela	B*2705	68.75 (33/48)	45.44	< 0.001