Fig 5. 6MWT distances at baseline and follow-up and correlations of Δ6MWT with ΔIPAP and ΔpCO₂.

A. Walking distances in the 6MWT at baseline and at follow-up. Each line represents a patient. B. Scatter plot illustrating the correlation of Δ6MWT (6MWT at follow-up– 6MWT at baseline) and ΔIPAP (IPAP at follow-up—IPAP at baseline). C. Scatter plot illustrating the correlation of Δ6MWT (6MWT at follow.up– 6MWT at baseline) and ΔpCO₂ (pCO₂ at follow-up—pCO₂ at baseline).