Table 5: HLA-DR allele frequency in the RA patients with and without lung affection.

HLA-DR	Group 1	Group 2	Total of patients	Chi-square	p-valor
DR-B1^*0101	7	13	20	0.889	0.346
DR-B1^*0301	6	2	8	3.323	0.068
DR-B1^*0401	15	27	42	2.28	0.136
DR-B1^*0701	10	5	15	3.587	0.058
DR-B1^*0801	4	5	9	0.000	0.994
DR-B1^*0901	2	2	4	0.054	0.816
DR-B1^*1001	2	3	5	0.040	0.841
DR-B1^*1101	10	8	18	1.129	0.288
DR-B1^*1201	3	2	5	0.525	0.469
DR-B1^*1301	6	14	20	2.096	0.148
DR-B1^*1401	4	4	8	0.114	0.736
DR-B1^*1501	5	6	11	0.006	0.936
DR-B1^*1601	5	5	10	0.145	0.703
DR-B3	10	12	22	0.015	0.904
DR-B3^*0101	2	-	2	2.565	0.109
DR-B3^*0107	3	2	5	0.525	0.469
DR-B3^*0201	3	7	10	0.928	0.335
DR-B^*0218	4	2	6	1.293	0.255
DR-B4	1	3	4	0.632	0.427
DR-B4^*0101	22	29	51	0.062	0.803
DR-B5	10	9	19	0.660	0.417
DR-B5^*0101	-	1	1	0.805	0.370
DR-B5^*0113	1	-	1	1.269	0.260

(Group 1) - Number total de patients without lung affection and with allele

(Group 2) - Number of patients with lung affection and with allele