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General characteristics of the subjects
| Variables | Osteosarcoma cases, n (%) | Controls, n (%) | P-value |
|---|---|---|---|
| Age (mean ± SD) | 16±3.28 | 16.24±3.30 | 0.378 |
| Sex | |||
| Male | 162 (58.70) | 159 (55.59) | 0.458 |
| Female | 114 (41.30) | 127 (44.41) | |
| Location | |||
| Trunk | 34 (12.32) | ||
| Limbs | 242 (87.68) | ||
| Enneking stages | |||
| IA or IB | 42 (15.22) | ||
| IIA or IIB or III | 234 (84.78) | ||
| Operation | |||
| Amputation | 55 (19.93) | ||
| Limb salvage | 221 (80.07) | ||
| Metastasis | |||
| Yes | 53 (19.20) | ||
| No | 223 (80.80) | ||
Abbreviation: SD, standard deviation.
