Table 1.
Demographic and clinical characteristics of osteosarcoma cases and control subjects
| Variables | Osteosarcoma cases | % | Control subjects | % | χ2-test | P value |
|---|---|---|---|---|---|---|
| Age | ||||||
| ≤ 20 | 92 | 55.6 | 170 | 51.6 | ||
| > 20 | 73 | 44.4 | 160 | 48.4 | 0.79 | 0.37 |
| Sex | ||||||
| Male | 108 | 65.3 | 215 | 65.3 | ||
| Female | 57 | 34.7 | 115 | 34.7 | 0.005 | 0.95 |
| Family history of cancer | ||||||
| No | 20 | 12.4 | 27 | 8.2 | ||
| Yes | 145 | 87.6 | 303 | 91.8 | 1.99 | 0.16 |
| Tumor location | ||||||
| Long tubular bones | 118 | 71.3 | ||||
| Axial skeleton | 47 | 28.7 | ||||
| Stage | ||||||
| I-II | 105 | 63.4 | ||||
| III-IV | 60 | 36.6 | ||||
| Therapy | ||||||
| Amputation | 35 | 21.3 | ||||
| Limb salvage | 130 | 78.7 | ||||
| Metastasis | ||||||
| Yes | 37 | 22.3 | ||||
| No | 128 | 77.7 |