(b)
| Genotypes/stadium | AA | AC | CC | All |
|---|---|---|---|---|
| EH | 8 | 1 | 0 | 9 |
| Grade 1 | 7 | 1 | 0 | 8 |
| Grade 2 | 20 | 6 | 0 | 26 |
| Grade 3 | 30 | 15 | 3 | 45 |
| grade 4 | 3 | 1 | 1 | 5 |
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