Bacterial culture of the sputum at registration
| Airway dilatation− n=14 | Airway dilatation+ n=18 | p-value | |
| Streptococcus ssp. | 0 (0) | 1 (6) | 0.37 |
| Staphylococcus ssp. | 0 (0) | 2 (11) | 0.20 |
| Pseudomonas aeruginosa | 0 (0) | 7 (39) | 0.01 |
| Other gram-negative bacilli | 2 (14) | 3 (17) | 0.85 |
| Haemophilus influenzae | 1 (7) | 0 | |
| Klebsiella oxytoca | 1 (7) | 0 | |
| Escherichia coli | 0 | 2 (11) | |
| Stenotrophomonas maltophilia | 0 | 1 (6) | |
| Normal flora only | 12 (86) | 8 (44) | 0.02 |
| No growth | 0 (0) | 1 (6) | 0.37 |
All values are expressed as n (%).