Table 5.

Comparison of overall survival (OS) with mean serum vascular endothelial growth factor (VEGF) level as the variable in patients with osteosarcoma

Variable (mean serum VEGF level)	Number of patients	Mean survival (month)	95 % CI (lower limit in months)	95 % CI (upper limit in months)	Cumulative survival at 2 years	P value
>3,500 pg/ml	26	15.34	13.62	17.05	67.2 %	0.282
<3,500 pg/ml	14	22.18	19.92	23.44	79.5 %

CIconfidence interval, P (log rank test) value for the comparison of survival data between groups. Significance p < 0.05