Table 4 Factors associating with the differential course of disease in the patients with rheumatoid arthritis associated usual interstitial pattern (RA-UIP) and non-UIP patterns (RA-non-UIP)
Factor | RA-ILD | RA-UIP | RA-non-UIP | P-value |
|---|---|---|---|---|
(n = 59) | (n = 35, 59.3 %) | (n = 24, 40.7 %) | ||
Oxygen therapy | 8 (13.6) | 8 (22.9) | 0 (0) | 0.016 |
Hospitalization due to respiratory illness | 1.29 ± 2.2 (0–11) | 1.9 ± 2.6 (0–11) | 0.5 ± 0.9 (0–4) | 0.004 |
Hospitalization due to cardiac illness | 0.6 ± 1.2 (0–5) | 0.7 ± 1.3 (0–5) | 0.4 ± 1.2 (0–4) | 0.100 |
Latest FVC % pred | 82 ± 21.2 | 78 ± 22.9 | 87 ± 17.2 | 0.091 |
(Baseline FVC %) | 85 ± 17.0 | 82 ± 17.1 | 89 ± 16.5 | |
Latest DLCO % pred | 61 ± 21.3 | 56 ± 20.6 | 69 ± 20.2 | 0.021 |
(Baseline DLCO %) | 71 ± 18.1 | 72 ± 20.7 | 70 ± 13.3 | |
Number of deaths | 33 (55.9) | 23 (65.7) | 9 (37.5)a | 0.046 |