Table 1.
—Comparison of the Presence or Absence of Cough With Other Baseline Variables
| Variable | Noncoughers (n = 42) | Coughers (n = 114) | P Value |
| Pulmonary function tests | |||
| FVC | 69 (10.5) | 65.85 (11.16) | .57 |
| Total lung capacity | 69.6 (14.7) | 66.60 (11.30) | .99 |
| Diffusing capacity of the lung for carbon monoxide | 50.4 (12.5) | 42.58 (11.95) | .047 |
| Health perception | |||
| Physical component summary | 38.47 (10.4) | 29.65 (8.76) | .0003 |
| Mental component summary | 48.62 (11.7) | 47.88 (10.82) | .58 |
| Baseline dyspnea index | 5.12 (2.21) | 6.24 (1.63) | .02 |
| Health Assessment Questionnaire | 0.74 (0.63) | 0.98 (0.68) | .39 |
| High-resolution CT scan | |||
| Maximal fibrosis | 1.59 (1) | 2.25 (1.01) | .005 |
| MaxGG | 0.61 (0.8) | 0.69 (0.73) | .64 |
| Maximal honeycomb score | 32 | 38 | .44 |
| BAL | |||
| PMN | 4.3 (4.25) | 7.74 (8.32) | .016 |
| Eos | 2.82 (5.22) | 2.88 (3.91) | .91 |
| Clinical | |||
| Rodnan | 17.86 (11.6) | 14.09 (10.7) | .033 |
| Diffuse | 76 | 55 | .01 |
| Gastroesophageal reflux disease | 43 | 67 | .56 |
| Proton pump inhibitor use | 55 | 52 | .74 |
Pulmonary function tests are presented as % predicted (SD), and clinical scores (except Rodnan) are presented as %. Eos = eosinophil; MaxGG = maximal ground glass; PMN = neutrophil.