Osteosarcoma of the Pelvis: Clinical Presentation and Overall Survival

Table 2

Cox proportional hazards model.

Variable	Hazard ratio	95% confidence interval
Age <25 (reference)
Age 25–60	1.641	1.079–2.495	0.020
Age >60	2.358	1.440–3.859	<0.001
Male (reference)
Female	1.034	0.732–1.461	0.850
Osteoblastic histology (reference)
Chondroblastic histology	0.705	0.461–1.078	0.107
Intracompartmental (reference)
Extracompartmental	1.062	0.655–1.724	0.806
Nonmetastatic (reference)
Metastatic at diagnosis	2.839	1.845–4.367	<0.001
Tumor ≤8 cm (reference)
Tumor >8 cm	1.541	1.017–2.336	0.042
No surgery (reference)
Received surgery	0.551	0.365–0.831	0.004