Table 4.

Frequencies of HLA-DQ alleles in patients with ExRA compared with patients with non-extra-articular RA

HLA-DQ allele	Allele frequency		P
	ExRA	Non-ExRA
DQ2	0.122	0.121	0.91
DQ3	0.017	0.029	0.50
DQ4	0.046	0.014	0.04
DQ5	0.129	0.188	0.06
DQ6	0.139	0.165	0.37
DQ7	0.252	0.249	1.00
DQ8	0.222	0.170	0.13
DQ9	0.066	0.043	0.22

Global: P = 0.11. ExRA, extra-articular RA.