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. 2021 Jul 30;12:672024. doi: 10.3389/fendo.2021.672024

Table 1.

Baseline clinical characteristics of osteosarcoma patients.

Training group (n = 996) Validation group (n = 661) χ2 P
Age, years 3.049 0.384
 ≤18 488 326
 19–30 209 122
 31–49 150 117
 ≥50 149 96
Sex 0.315 0.575
 Male 533 363
 Female 463 298
Race 1.250 0.535
 Black 165 96
 Other 90 61
 White 741 504
Primary site 2.372 0.305
 Axial 70 47
 Limb 818 526
 Other 108 88
Grade 0.009 0.925
 I–II 128 86
 III–IV 868 575
Histological type 4.655 0.589
 9180 623 419
 9181 154 95
 9182 47 39
 9183 36 26
 9184 4 2
 9185 13 3
 Other 119 77
T 3.871 0.144
 T1 404 296
 T2 561 351
 T3 31 14
N 0.660 0.417
 N0 972 649
 N1 24 12
M 0.375 0.540
 M0 840 550
 M1 156 111
Tumor size, mm 1.862 0.394
 <50 131 98
 50–100 463 316
 >100 402 247

9180, Osteosarcoma, NOS; 9181, Chondroblastic osteosarcoma; 9182, Fibroblastic osteosarcoma; 9183, Telangiectatic osteosarcoma; 9184, Osteosarcoma in Paget disease of bone; 9185, Small cell osteosarcoma.