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Comparison of allele carrier frequencies in RA cases and controls in accordance with the du Montcel classification
| Allele | RA patients, n (%) (n = 143) | Controls * , n (%) (n = 1,104) | Χ 2 test | OR (95% CI) | P value |
|---|---|---|---|---|---|
| S1 | 55 (39) | 853 (77) | 40.3 | 0.4 (0.3 to 0.5) | <0.0001 |
| S2 | 28 (20) | 110 (10) | 10.3 | 2.0 (1.3 to 3.2) | 0.0013 |
| S3D | 38 (27) | 361 (33) | 0.1 | 0.9 (0.6 to 1.3) | 0.7060 |
| S3P | 61 (43) | 313 (28) | 9.6 | 1.6 (1.2 to 2.2) | 0.0019 |
| X | 64 (45) | 616 (56) | 3.6 | 0.8 (0.6 to 1.0) | 0.0571 |
