Cases were categorized into 1 of 4 categories of CHD: single-ventricle (SV) physiology; 2-ventricle heart disease requiring complex repair (CR), defined asRiskAdjustmentforCongenitalHeart Surgery1class3orhigher;2-ventricle heart disease requiring simple repair (SR), defined as Risk Adjustment for Congenital Heart Surgery class 1 or 2; and2-ventricleheartdiseaserequiring norepair(NR).9Caseswereclassifiedon thebasisofindicatedorplannedrepair at the last evaluable visit rather than whetherrepairhadoccurredatthetime of the last evaluated visit. Chart review wasusedtodeterminetheageatrepair