Table 1 Allele and genotype frequencies of the PTPN22 1858C→T polymorphism in 197 patients with AS and 551 healthy controls.

	Patients with AS	Healthy controls	p Value*	OR (95% CI)
	(%)	(%)
C/C	166 (84.3)	462 (83.8)	0.89	1.03 (0.65 to 1.65)
C/T	28 (14.2)	84 (15.2)	0.72	0.92 (0.56 to 1.5)
T/T	3 (1.5)	5 (0.9)	0.47	1.69 (0.32 to 8.17)
C	360 (91.4)	1008 (91.5)	0.95	0.99 (0.64 to 1.52)
T	34 (8.6)	94 (8.5)	0.95	1.01 (0.66 to 1.55)

*3×2 contingency table, overall p value  =  0.73.