| Alleles | ABI | Total | P value | |
| Normal | Abnormal | |||
| E2E2, E2E3, E2E4 | 9 (75%) | 3 (25%) | 12 (100%) | 0.769 |
| E3E3 | 22 (66.7%) | 11 (33.3%) | 33 (100%) | |
| E3E4, E4E4 | 17 (63%) | 10 (37%) | 27 (100%) | |