Figure 4
From: Assessment of measurement properties of peak VO2in children with pulmonary arterial hypertension
Relationship of percentage change in peak VO 2 with change in WHO FC. Percentage change in peak VO2 and change in WHO FC was for baseline to end of treatment values. Patients with WHO FC I (A), WHO FC II (B), and WHO FC III (C) at baseline. Note: no improvement was possible for patients with WHO FC I at baseline and improvement of only 1 FC was possible for patients with WHO FC II at baseline. VO2 = oxygen consumption; WHO FC = World Health Organization Functional Class.