HLA typing in patients with selective IgA deficiency (SigAD) and in those with normal serum IgA (controls)
| SigAD (n=23) (%) | Control (n/total) (%) | EF | PF | RR | |
| B8 | 4 (17.4) | 70/174 (40.2) | – | 0.28 | 0.31 |
| DR37-150 | 21 (91.3) | 130/270 (48.1) | 0.83 | – | 11.31 |
| DR7 | 12 (52.2) | 96/270 (35.5) | 0.26 | – | 1.98 |
| DQW2 | 22 (95.7) | 217/272 (79.7) | 0.79 | – | 5.58 |
↵7-150 SIgAD v control p < 0.002.
RR, relative risk; EF, aetiological fraction; PF, preventive fraction.