Table 3 SOD1, SOD2 and catalase polymorphism allele and genotype frequencies in COPD patients and resistant smokers.
| Polymorphism | Allele frequencies (%) | Genotype frequencies (%) | |||
|---|---|---|---|---|---|
| SOD1–intron 3 SNP | A | C | AA | AC | CC |
| COPD | 95 | 5 | 92 | 7 | 1 |
| Resistant smokers | 94 | 6 | 90 | 9 | 1 |
| SOD2–Val16Ala | T | C | TT | TC | CC |
| COPD | 49 | 51 | 23 | 52 | 25 |
| Resistant smokers | 49 | 51 | 22 | 54 | 24 |
| Catalase–promoter SNP | T | A | TT | TA | AA |
| COPD | 28 | 72 | 7 | 41 | 52 |
| Resistant smokers | 31 | 69 | 10 | 42 | 48 |
No significant differences were found for either the allele or genotype (absolute) frequencies for all three polymorphisms.