Table 1

Summary statistics for residues of amino acid at position 97 of HLA-B and association with psoriatic arthritis compared with cutaneous psoriasis alone

Residue	Amino acid	Frequency	p Value	OR	95% CI
R	Arginine	0.4619	Ref	Ref	Ref
S	Serine	0.2785	3.58E-05	1.45	1.22:1.74
T	Threonine	0.1003	0.716	0.959	0.76:1.20
V	Valine	0.0751	0.913	0.988	0.78:1.24
N	Asparagine	0.0474	5.76E-08	2.46	1.78:3.42
W	Tryptophan	0.0384	0.283	0.795	0.52:1.20