Table 3. Association between perfusion values and overall survival times ^*.

Perfusion Values	Hazard Ratio	Wald Lower	Wald Upper	P value
rCBVmean of nonenhanced tumor (ratio)	1.699	0.754	3.829	0.20
rCBVmean of enhanced tumor (ratio)	0.994	0.805	1.229	0.96
rCBVmean of whole tumor (ratio)	0.994	0.809	1.220	0.95
rCBV5%max (ratio)	1.076	0.971	1.193	0.16
rCBV10%max (ratio)	1.079	0.959	1.214	0.21
rCBVhigh_perfusion (ratio)	1.010	0.910	1.120	0.85
rCBVvariation_mean of nonenhanced tumor	0.999	0.994	1.005	0.81
rCBVvariation_mean of enhanced tumor	0.999	0.991	1.006	0.77
rCBVvariation_mean of whole tumor	0.994	0.988	1.001	0.09
rCBVvariation_max of nonenhanced tumor	1.000	0.998	1.002	0.75
rCBVvariation_max of enhanced tumor	0.999	0.998	1.001	0.41
rCBVvariation_max of whole tumor	1.000	0.999	1.002	0.64

Note: * Association are calculated via Cox proportional hazard regression with adjustment of patient age at diagnosis, sex, histopathologic grade, extent of surgery, tumor volume, and therapeutic measures. rCBV_mean, mean rCBV; rCBV_5%max, 5% maximum rCBV; rCBV_10%max, 10% maximum rCBV; rCBV_{high_perfusion}, maximum rCBV; rCBV_{variation_mean}, mean rCBV variation; rCBV_{variation_max}, maximum rCBV variation.