Table 5. ABC score, RACHS-1 score, and early mortality rate by patient age.

Age	<1 month	<3 months	<1 year	1–2 years	2–6 years	6–10 years	10–18 years	≥18 years
ABC score (mean)	8.2	7.5	7.2	6.6	6.9	6.3	6.3	5.4
RACHS-1 score (median)	3	2	2	2	2	2	2	1
Early mortality (%)	12.2	8.2	6.0	3.0	2.3	2.5	1.8	2.8

ABC = Aristotle Basic Complexity; RACHS-1 = Risk Adjustment for Congenital Heart Surgery-1.