Categorical risk factors included: type of Congenital Heart Defects (i.e., cyanotic Vs acyanotic), low arterial oxygen saturation (PaO 2<85) before surgery, type of cardiac surgery (i.e., corrective VS palliative), and parents education or one will take care of the child (more than high school), intraoperative procedures, length of stay in intensive care (days), total duration of hospitalization (days), and number of subsequent hospitalization and cardiac surgeries.

Functional Measurers: