Table 4. Risk factors for airway bacterial colonization.
| Variables | OR | 95% CI | P value |
|---|---|---|---|
| Univariate | |||
| Gender (M/F) | 0.169 | 0.021-1.384 | 0.131 |
| Age (<60, 60-70, ≥70) | 2.175 | 1.017-4.650 | 0.045 |
| BMI (<25, ≥25) | 1.42 | 0.419-4.816 | 0.81 |
| Smoking index (0, 0-400, ≥400 cigarette-years) | 2.097 | 1.043-4.215 | 0.038 |
| Comorbidity of COPD | 2.407 | 0.682-8.492 | 0.301 |
| FEV1 (≥80%, 70-80%, <70%) | 1.289 | 0.651-2.554 | 0.466 |
| MVV (≥70%, <70%) | 2.127 | 0.247-18.310 | 0.795 |
| DLco (≥70%, <70%) | 2.677 | 0.751-9.546 | 0.234 |
| Multivariate | |||
| Age (<60, 60-70, ≥70) | 2.263 | 1.030-4.970 | 0.042 |
| Smoking index (0, 0-400, ≥400 cigarette-years) | 2.163 | 1.059-4.429 | 0.034 |
BMI, body mass index; CI, confidence interval; COPD, chronic obstructive pulmonary disease; DLco, diffusing capacity of the lung for carbon monoxide; F, female; FEV1, forced expiratory volume in one second; M, male; MVV, maximum ventilatory volume; OR, odds ratio.