Sociodemographic and medical variables in the 89 enrolled patients tested by univariate analysis
| Fixed pulmonary hypertension (yes or no) |
| Rhythm disturbances (yes or no) |
| Pacemaker (yes or no) |
| Cyanosis (yes or no) |
| Cardiac transplantation or awaiting for transplantation (yes or no) |
| Postoperative complication (yes or no) |
| Congenital extracardiac malformation (yes or no) |
| Number of surgical interventions |
| Number of drugs taken daily |
| Interventional catheterisation (yes or no) |
| Psychosocial problems (yes or no) |
| Orthopaedic problems (yes or no) |
| Congestive heart failure (yes or no) |
| Type of single ventricle (1=tricuspid atresia; 2=double inlet heart; 3=mitral atresia; 4=others) |
| Job (yes or no) |
| Lifestyle (1=with parents, 2=special institution, 3=independent) |
| Educational level (1=low; 2=intermediate; 3=high) |