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Frequency of the different blood groups in the study population (n = 44). The figures in parentheses are the number of the patients.
| Blood group | O | A | B | AB |
| Cases | (30) 68.1% | (6) 13.6% | (6) 13.6% | (2) 4.5% |
| Controls | (11) 27.3% | (28) 63.6% | (3) 6.8% | (2) 4.5% |
| P value | <0.05 | <0.01 | NS | NS |
