Patient characteristics and surgical history
| Diagnosis | |
| TOF (n) | 193 |
| PA-VSD (n) | 20 |
| Gender | |
| Male (n) | 130 |
| Female (n) | 83 |
| Genetic syndrome | |
| Trisomy 21 (n) | 7 |
| 22q11 Deletion (n) | 15 |
| Other (n) | 13 |
| Initial surgery | |
| Palliative shunt (n) | 35 |
| Primary repair (n) | 178 |
| Age (years)±SD | |
| Mean age at corrective surgery | 1.35±2.91 |
| Mean age at entry into study | 11.53±11.93 |
| Mean age at most recent INT | 5.2±9.74 |
INT, intervention; TOF, tetralogy of Fallot; PA-VSD, pulmonary atresia-ventricular septal defect.