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| Age, years | 9.9 (± 4.4) |
| Female sex | 27 (60%) |
| Etiology | |
| Idiopathic | 23 (51.1%) |
| Familial | 4 (8.9%) |
| Pulmonary Venooclusive Disease | 3 (6.7%) |
| Congenital Heart Disease | 11 (24.4%) |
| Other | 4 (8.9%) |
| Race | |
| White | 39 (86.7%) |
| Hispanic | 3 (6.7%) |
| Romani | 3 (6.7%) |
Data are median (range), mean (SD), or n (%).
