Table 4: The distribution of allele frequencies of ERAP1, IL23R and PTGER4 SNPs of mild- and severe- radiographic AS patients*.

Mild-AS (n = 171) Severe-AS (n = 64) P value OR (95%CI)
Allele frequency
ERAP1 rs30187
C
Tǂ
59 (34.5)
112 (65.5)
19 (29.7)
45 (70.3)		 0.86 0.91 (0.34 to 2.4)
ERAP1 rs27044
C
Gǂ
85 (49.7)
86 (50.3)
29 (45.3)
35 (54.7)		 0.78 1.14 (0.46 to 2.84)
IL23R rs11209032
G
Aǂ
54 (31.6)
117 (68.4)
18 (28.1)
46 (71.9)		 0.61 1.24 (0.54 to 2.85)
PTGER4 rs10440635
G
Aǂ
47 (27.5)
124 (72.5)
17 (26.6)
47 (73.4)		 0.39 0.68 (0.29 to 1.62)

*Values are provided as n (%).
ǂRisk allele; OR= odds ratio; CI= confidence interval.