Then, we obtained the multivariate logistic regression model: Ln[pr(Severe Asthma)/1-pr(Severe Asthma)] = −0.133–0.049 × DLCO%pred + 0.565 × blood absolute value of neutrophils −0.132 × blood percentage of eosinophils + 0.004 × blood 8-iso-PGF2α + 0.018 × blood SOD. This evidence concerns the gene SOD1 and asthma.