Receiver operating characteristic curve data
| Sensitivity | Specificity | |
| 6MWD % pred | ||
| <68 | 0.45 | 0.3 |
| <52 | 0.18 | 0.84 |
| <40 | 0.14 | 0.6 |
| DL,CO % pred | ||
| <75 | 0.95 | 0.41 |
| <60 | 0.82 | 0.6 |
| <53 | 0.73 | 0.69 |
| <27.5 | 0.23 | 0.93 |
| O2 saturation at 6 min % | ||
| <92 | 0.9 | 0.77 |
| <90 | 0.73 | 0.92 |
| <88 | 0.5 | 1 |
| <80 | 0.12 | 1 |
Data are presented for 6-min walk distance (6MWD) % predicted, diffusing capacity of the lung for carbon monoxide (DL,CO) % pred and oxygen saturation at 6 min versus presence of pulmonary hypertension as determined by right heart catheterisation. Receiver operating characteristic curves from which these data were obtained are shown in figure 3⇑.