Correlation of PD Versus PA-aO2 and PAsP at Different Follow-up Times
| Correlation | Baseline | 1 wk | 1 mo | 6 mo | 1 y |
| PD vs. PA-aO2 | 0.29 (P < 0.001) | 0.19 (P < 0.05) | 0.24 (P < 0.05) | 0.20 (P < 0.05) | 0.34 (P < 0.0001) |
| PD vs. PAsP | 0.04 (P = 0.68) | — | — | 0.36 (P < 0.001) | 0.25 (P < 0.05) |