Frequency of albuminuria (defined as an albumin-to-creatinine ratio ≥30 mg/g) according to underlying congenital heart disease diagnosis. The solid line represents the approximate general population prevalence (6.5%). Subgroups included 18 patients with Eisenmenger syndrome/complex cyanotic, 18 with a simple shunt with clinical sequelae, 86 with single ventricle Fontan circulation, 60 with TGA with systemic RV, 16 with AVSD, 16 with Ebstein anomaly, 126 with tetralogy of Fallot, 20 with TGA with systemic left ventricle, 141 with left ventricular obstructive lesions, 71 with a simple shunt with no sequelae, and 40 with miscellaneous other disorders. AVSD indicates atrioventricular septal defect; LV, left ventricle; RV, right ventricle; TGA, transposition of the great arteries.