Table 1.
Patients’ demographics
| Characteristic | All (n = 119) | Successful (n = 75) | Unsuccessful (n = 44) | P value |
|---|---|---|---|---|
| Age (year) | 45 (28, 56) | 43 (24, 55) | 50 (34, 59) | 0.034* |
| Female sex—no. (%) | 52 (43.7) | 39 (52.0) | 13 (29.5) | 0.017* |
| Smoking status | 0.035* | |||
| Current | 26 (21.9) | 11 (14.7) | 15 (34.1) | |
| Former | 21 (17.6) | 13 (17.3) | 8 (18.2) | |
| Nonsmoker | 72 (60.5) | 51 (68.0) | 21 (47.7) | |
| Underlying lung disease | ||||
| COPD | 8 (6.7) | 6 (8.0) | 2 (4.5) | 0.709 |
| Asthma | 4 (3.4) | 2 (2.7) | 2 (4.5) | 0.626 |
| Lung cancer | 9 (7.6) | 6 (8.0) | 3 (6.8) | 1.000 |
| Bronchiectasis | 3 (2.5) | 3 (4.0) | 0 | 0.295 |
| Symptom | ||||
| Cough | 51 (42.9) | 36 (48.0) | 15 (34.1) | 0.139 |
| Fever | 6 (5.0) | 4 (5.3) | 2 (4.5) | 1.000 |
| Dyspnea | 108 (90.8) | 68 (90.7) | 40 (90.9) | 1.000 |
| Chest pain | 4 (3.4) | 1 (1.3) | 3 (6.8) | 0.142 |
| WBC (× 109/l) | 6.40 (5.10, 7.60) | 5.90 (5.24, 7.40) | 6.65 (4.68, 8.35) | 0.725 |
| Neutrophil percentage (%) | 64.8 (56.6, 71.0) | 64.5 (56.6, 70.0) | 65.4 (56.8, 72.0) | 0.928 |
| CRP (mg/l) | 2.5 (0.8, 7.8) | 2 (0.6, 4.9) | 5 (1.1, 10.5) | 0.027* |
| ESR (mm/h) | 14 (8, 24) | 12 (7, 19) | 17.5 (8, 30.8) | 0.130 |
| ABG | 0.460 | |||
| Type I respiratory failure | 3 (2.8) | 3 (4.8) | 0 (0) | |
| Type II respiratory failure | 4 (3.7) | 2 (3.2) | 2 (4.5) | |
| CO2 retention | 9 (8.4) | 4 (6.3) | 5 (11.4) | |
| FEV1/pred (%) | 52.9 ± 20.2 | 54.9 ± 20.1 | 48.4 ± 20.1 | 0.198 |
| PEF/pred (%) | 35.7 (18.6, 63.1) | 39.0 (19.4, 60.7) | 24.4 (15.7, 69.2) | 0.494 |
| FVC/pred (%) | 79.3 ± 18.8 | 80.8 ± 19.2 | 76.0 ± 17.9 | 0.312 |
| FEV1/FVC (%) | 57.8 (38.4, 71.0) | 60.1 (38.0, 71.0) | 48.1 (39.2, 75.5) | 0.666 |
Data were expressed as count (percentage), mean ± SD or median (interquartile range) as appropriate
COPD chronic obstructive pulmonary diseases, FEV1 forced expiratory volume in one second, PEF peak expiratory flow, FVC forced vital capacity, CRP C-reactive protein, ESR erythrocyte sedimentation rate, WBC white blood cell, CO2 Carbon dioxide, ABG arterial blood gas
*p < 0.05