Table 4.
Characteristics of obstructive lung disease in patients with RA and non-RA patients
| RA (52 patients) | Non-RA (40 patients) | |
|---|---|---|
| Mean ± SD age at RA diagnosis, years | 54.0 ± 13.2 | 57.5 ± 14.1 |
| Mean ± SD age at OLD diagnosis, years | 69.2 ± 12.9 | 74.4 ± 10.4 |
| Men (n, %) | 23 (44.2) | 16 (40.0) |
| Current smoker (n, %) | 31 (59.6) | 21 (52.5) |
| Former smoker (n, %) | 12 (23.1) | 12 (30.0) |
| X-ray or CT abnormal (at any time) | ||
| Emphysema (n,%) | 27 (51.9) | 14 (35.0) |
| Bronchiectasis (n,%) | 5 (9.6) | 1 (2.5.) |
| Interstitial lung disease (n, %) | 7 (13.5) | 1 (2.5.) |
| Minimum FEV1, L (at any time) | ||
| Mean ± SD | 1.30 ± 0.73 | 1.45 ± 0.56 |
| 0.37 to <0.84 (n, %) | 17 (32.7%) | 6 (15.0%) |
| 0.84 to <1.29 (n, %) | 13 (25.0%) | 10 (25.0%) |
| 1.29 to <1.85 (n, %) | 11 (21.2%) | 12 (30.0%) |
| 1.85 to <3.41 (n, %) | 11 (21.2%) | 12 (30.0%) |
SD=standard deviation; RA=rheumatoid arthritis; OLD=obstructive lung disease; CT=computer tomography; FEV1=forced expiratory volume; FVC=forced vital capacity