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Figure 4 Relationship between age at Fontan operation and peak oxygen uptake (PO₂) in patients after the Fontan operation (excluding patients with significant atrioventricular valve regurgitation and/or hypoxia). Open circles = group LV; open squares = group BV; closed circles = group RV. BV = biventricle; LV = left ventricle; RV = right ventricle.