Table 3 Univariate and multivariate analyses of predictive factors for positive bacterial load
From: Bacteria in sputum of stable severe asthma and increased airway wall thickness
Univariate analysis | ||||
Predicting factors | Odds ratio | 95% CI | P-value | |
   Age | 1.012 | 0.971-1.055 | NS | |
   Gender | 1.111 | 0.362-3.413 | NS | |
   Duration of asthma | 1.046 | 1.005-1.089 | 0.029 | |
   Exacerbations in past year | 1.258 | 1.024-1.544 | 0.029 | |
   Smoking | 1.764 | 0.602-5.171 | NS | |
   FEV1 (% pred) | 0.983 | 0.962-1.005 | NS | |
   √WA at Pi of 10 mm | 0.627 | 0.175-2.248 | NS | |
Multivariate analysis | ||||
Predicting factors | Odds ratio | Adjusted Odds ratio* | 95% CI | P-value |
   Duration of asthma | 1.046 | 1.058 | 1.004-1.116 | 0.035 |
   Exacerbations in past year | 1.258 | 1.630 | 1.132-2.347 | 0.009 |
   √WA at Pi of 10 mm | 0.627 | 0.631 | 0.168-2.372 | NS |