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Table 1. Characteristics of Children With Extraosseous Ewing Sarcoma and Skeletal Ewing Sarcomaa
| Characteristic | Extraosseous Ewing Sarcoma | Skeletal Ewing Sarcoma | P Value |
|---|---|---|---|
| Mean age (range), years | 20 (0–39) | 16 (0–39) | <.001 |
| Male | 53% | 63% | <.001 |
| White race | 85% | 93% | <.001 |
| Axial primary sites | 73% | 54% | <.001 |
| Pelvic primary sites | 20% | 27% | .001 |
aAdapted from Applebaum et al.[23]