Treatment administered to 161 patients with usual interstitial pneumonia (UIP), nonspecific interstitial pneumonia (NSIP) and respiratory bronchiolitis interstitial lung disease/desquamative interstitial pneumonia (RBILD/DIP)
| Treatment regimen | UIP | NSIP | RBILD/DIP |
| n (%) | n (%) | n (%) | |
| None | 7 (7) | 2 (6) | 2 (9) |
| Prednisone alone* | 35 (33) | 18 (55) | 10 (46) |
| Prednisone+azathioprine or cyclophosphamide | 31 (29) | 4 (12) | 6 (27) |
| Zileuton | 21 (20) | 4 (12) | 0 (0) |
| Azathioprine alone | 5 (4) | 4 (12) | 1 (4) |
| Miscellaneous | 7 (7) | 1 (3) | 3 (14) |
*: 39 of the patients with UIP and NSIP received prednisone as part of a prospective study of high-dose steroids in idiopathic pulmonary fibrosis (see Therapy section for details)