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