Clinical Characteristics at Presentation
| Characteristic | Children (n=170) | Adults (n=583) | Total (n=753) | p Value |
| Male Gender | 92 (54%) | 280 (48%) | 372 (49%) | 0.162 |
| Age at Diagnosis (years) | 12±5 | 42±15 | 35±18 | <0.001 |
| Ethnicity | 0.006 | |||
| Non-Hispanic Caucasian | 74 (44%) | 320 (55%) | 387 (53%) | |
| Black | 9 (5%) | 42 (7%) | 51 (7%) | |
| Hispanic | 54 (31%) | 135 (23%) | 182 (25%) | |
| Asian | 29 (17%) | 73 (13%) | 102 (14%) | |
| Native American | 1 (1%) | 8 (2%) | 9 (1%) | |
| Initial Presentation with Hemorrhage | 100 (59%) | 239 (41%) | 339 (45%) | <0.001 |