Table 1. the clinical and pathological features in 58 human conventional osteosarcomas.

		N	Disease free survival				Overall survival
			P	HR	95.0% CI		P	HR	95.0% CI
					L	U			L	U
Sex	Male	29	0.86				0.07*
	Female	29	0.86	1.11	0.36	3.44	0.08	3.49	0.86	14.28
Age group	<=15y	14	0.76				0.79
	15-20y	23	0.94	1.10E+04	0	1.40E+116	0.5	1.82	0.32	10.42
	21-30y	11	0.94	3.70E+04	0	4.40E+116	0.72	0.73	0.13	4.05
	31-40y	1	0.93	5.30E+04	0	6.40E+116	0.97	0	0	1.90E+282
	>40y	9	1	1.02	0	3.90E+225	0.99	0	0	.
Tumor location	limbs	51	0.28				0.97
	Others	7	0.48	23.34	0.004	1.60E+05	0.97	0.97	0.12	7.72
Enneking stage	1	4	0.96				0.43
	IIA	19	0.78	0.71	0.06	7.88	0.17	0.1	0.004	2.74
	IIB	2	0.631	0.59	0.07	5.01	0.1	0.09	0.01	1.61
	III	1	0.897	0.83	0.05	13.39	0.99	0	0
Neoadjuvant	No	10	0.51				1.5E-4*
chemotherapy	Yes	30	0.51	1.51	0.44	5.15	0.003	11.85	2.36	59.45
Adjuvant	No	3	0.21				0.41
chemotherapy	Yes	19	0.43	0.04	0	129.34	0.61	0.04	0	1.20E+04
recurrence	No	50					0.49
	Yes	8					0.49	2.05	0.26	16.26
Metastasis	No	38					0.045*
	Yes	11					0.436	0.01	0	2.40E+03

^*Significantly different;

L: lower; U: upper