From the primary cohort, the hazard ratio (95% confidence interval) for
all-cause mortality is plotted for PVR 1–6 WU relative to a reference
value of 1.0 WU in patients with mean pulmonary artery pressure ≥19 mmHg
(A). This population was then restricted to PAWP ≤15
mmHg (B) and, alternatively, to PAWP >15 mmHg
(C). WU, Wood unit. The grey line inset is the kernel density
estimate, representing the relative density of patients across PVR levels.