| Genotype | Treatment | <2 exacerbations/year (n) | ≥2 exacerbations/year (n) |
| SZ | Treated | 6 | 4 |
| SZ | Untreated | 18 | 13 |
| ZZ | Treated | 15 | 14 |
| ZZ | Untreated | 2 | 2 |
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