Table 1.
Baseline Subject Characteristics
| Characteristic | NJH IPF (n = 80) | BWH IPF (n = 101) | Control Subjects (n = 160) | RA-UIP (n = 40) | HP (n = 46) | P Valuea |
|---|---|---|---|---|---|---|
| Age, y | 68 ± 7 | 68 ± 8 | 56 ± 11 | 64 ± 10 | 61 ± 10 | < .01 |
| Female sex | 12 (15) | 29 (29)b | 127 (79) | 20 (50) | 22 (48) | < .01 |
| Ever smoker | 57 (71) | 57 (59)c | … | 24 (62)c | 25 (56)c | .25 |
| FVC, % predicted | 67 ± 15 | 64 ± 17d | … | 72 ± 18d | 67 ± 19d | .17 |
| Dlco, % predicted | 43 ± 15 | 43 ± 18e | … | 46 ± 15e | 49 ± 15 | .35 |
Data are presented as mean ± SD or No. (%). BWH = Brigham Women’s Hospital; Dlco = diffusing capacity of the lung for carbon monoxide; HP = hypersensitivity pneumonitis; IPF = idiopathic pulmonary fibrosis; NJH = National Jewish Health; RA-UIP = rheumatoid arthritis-associated usual interstitial pneumonia.
P values compare mean levels (analysis of variance) or percent positive (χ2) between all groups.
Two subjects had missing data for sex.
Four BWH patients with IPF, one patient with HP, and one patient with RA-UIP had missing smoking history.
FVC results missing in 31 BWH patients with IPF, five patients with RA-UIP, and one patient with HP.
Dlco results missing in 52 BWH patients with IPF and four patients with RA-UIP.