Table 1.
Baseline Characteristics of Study Populations
| Control Subjects | Pittsburgh IPF | Yale IPF | |
|---|---|---|---|
| n | 44 | 81 | 82 |
| Age, yr | |||
| Mean ± SD | 70.23 ± 7.13 | 67.18 ± 8.27 | 71.72 ± 7.93 |
| Sex, n (%) | |||
| Male | 31 (70.45) | 63 (77.78) | 71 (86.59) |
| Female | 13 (29.55) | 18 (22.22) | 11 (13.41) |
| Race n (%) | |||
| White | 39 (88.64) | 78 (96.30) | 80 (97.56) |
| Other | 5 (11.36) | 3 (3.70) | 2 (2.50) |
| Smoking status, n (%) | |||
| Ever/current | 9 (20.45) | 38 (46.91) | 66 (80.49) |
| Never | 35 (79.55) | 26 (32.10) | 16 (19.51) |
| Unknown | 0 (0) | 17 (20.99) | 0 (0) |
| FVC, % predicted, mean ± SD | 65.38 ± 18.44 | 75.43 ± 17.60 | |
| DlCO, % predicted, mean ± SD | 50.41 ± 18.19 | 42.89 ± 14.94 | |
| GAP index, mean ± SD | 3.88 ± 1.56 | 4.26 ± 1.36 |
Definition of abbreviations: DlCO = diffusing capacity of the lung for carbon monoxide; IPF = idiopathic pulmonary fibrosis.