Table 1. Clinical features and pulmonary function indices at presentation, compared between patients dying within 2 yrs and those dying after more than 2 yrs of follow-up.
| Early deaths | Late deaths | Statistical significance | |
| Subjects n | 31 | 31 | |
| Age yrs | 53.9±10.4 | 56.3±6.4 | ns |
| Males/females n | 23/8 | 38/4 | p = 0.06 |
| Dyspnoea duration months | 24 (2–120) | 9.5 (0–65) | p = 0.001 |
| CPI unadjusted units | 55.3±13.4 | 46.7±7.8 | p<0.001 |
| FEV1 % pred | 67.2±16.6 | 79.8±12.1 | p<0.0005 |
| FVC % pred | 62.0±20.0 | 78.7±14.3 | p<0.0001 |
| D L,CO % pred | 39.4±14.5 | 45.8±11.3 | p = 0.04 |
| P O2 kPa | 8.8±1.8 | 10.4±1.4 | p<0.0005 |
Data are presented as mean±sd or median (range), unless otherwise stated. CPI: composite physiological index; FEV1: forced expiratory volume in 1 s; % pred: % predicted; FVC: forced vital capacity; DL,CO: diffusing capacity of the lung for carbon monoxide; PO2: oxygen tension; ns: not significant. Reproduced from [21] with permission from the publisher.