Table 1. Characteristics of patients in the training and validation sets.
| Variable | Training Set | Validation Set | λ2 | P-value |
|---|---|---|---|---|
| Gender | ||||
| Male | 212 | 71 | 0.003 | 0.96 |
| Female | 128 | 43 | ||
| Age | ||||
| <14 | 103 | 44 | 2.69 | 0.10 |
| ≥14 | 237 | 70 | ||
| Histological type | ||||
| Osteoblastic | 272 | 88 | 3.28 | 0.35 |
| Chondroblastic | 46 | 13 | ||
| Fibroblastic | 10 | 5 | ||
| Others | 12 | 8 | ||
| Enneking stage | ||||
| IIA | 38 | 15 | 5.26 | 0.07 |
| IIB | 265 | 89 | ||
| III | 37 | 10 | ||
| Tumor size | 1.87 | 0.17 | ||
| ≤8 cm | 156 | 40 | ||
| >8 cm | 184 | 74 | ||
| Surgery type | 0.87 | 0.35 | ||
| Amputation | 75 | 30 | ||
| Limb sparing | 265 | 84 | ||
| WBC (mean ± SD) × 109 | 8.1 ± 2.9 | 8.1 ± 3.2 | 0.96 | |
| Neutrophil (mean ± SD) × 109 | 5.1 ± 2.3 | 4.9 ± 2.4 | 0.84 | |
| Lymphocyte (mean ± SD) × 109 | 2.2 ± 0.7 | 2.2 ± 0.7 | 0.61 | |
| Platelet (mean ± SD) × 109 | 294.6 ± 82.7 | 285.4 ± 83.6 | 0.31 | |
| Hemoglobin (mean ± SD) × 109 | 130.8 ± 20.3 | 130.7 ± 19.1 | 0.95 | |
| Albumin (mean ± SD) | 44.2 ± 5.2 | 43.3 ± 4.8 | 0.12 | |
| Fibrinogen (mean ± SD) | 3.6 ± 1.3 | 3.7 ± 2.0 | 0.37 | |
| LDH (mean ± SD) | 284.2 ± 294.2 | 251.8 ± 161.6 | 0.27 | |
| ALP (mean ± SD) | 355.3 ± 634.1 | 292.8 ± 453.2 | 0.33 |
WBC: white blood cell; LDH: lactate dehydrogenase; ALP: alkaline phosphatase.