| Number (%) | Sex Female/Male | Age at diagnosis m ± ET* |
Primary bone tumors | 43 (25.9) | 0.9 | 51.18 ± 16.12 |
Secondary bone Tumors | 123 (74.1) | 0.6 | 56.27 ± 14.92 |
-determined etiology | 82 (66.6) | 0.5 | 58.93 ± 13.61 |
-unknown etiology | 41 (33.3) | 1.05 | 54.35 ± 20.11 |