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.