Clinical features of patients with rheumatoid arthritis with and without fibrosing alveolitis (FA)
| Clinical feature | FA (n=28) | No FA (n=122) | p Value (χ2 test) |
| Male | 9 | 41 | 1 |
| Subcutaneous nodules | 18 | 65 | 0.4 |
| Dyspnoea: NYHA grade II | 15 | 69 | 0.84 |
| Dyspnoea: NYHA grade III | 5 | 8 | 0.07 |
| Productive cough | 13 | 44 | 0.39 |
| Never smoked | 5 | 40 | 0.17 |
| Finger clubbing | 5 | 11 | 0.182 |
| Bibasal crackles | 15 | 11 | <0.001 |
| CXR diagnostic of FA | 4 | 6 | 0.09 |
| Restrictive PFTs | 4 | 5 | 0.06 |
| Rheumatoid factor positive | 25 | 91 | 0.13 |
NYHA = New York Health Association grading of dyspnoea; CXR = chest radiograph; PFT = pulmonary function test.