Table 6. Association between perfusion values and overall survival times in GBM patients^*.

Perfusion Values	Hazard Ratio	Wald Lower	Wald Upper	P value
rCBVmean of nonenhanced tumor (ratio)	2.373	0.603	9.343	0.22
rCBVmean of enhanced tumor (ratio)	0.943	0.736	1.209	0.65
rCBVmean of whole tumor (ratio)	1.004	0.801	1.257	0.98
rCBV5%max (ratio)	1.082	0.950	1.233	0.23
rCBV10%max (ratio)	1.077	0.927	1.253	0.33
rCBVhigh_perfusion (ratio)	1.010	0.910	1.120	0.85
rCBVvariation_mean of nonenhanced tumor	0.997	0.991	1.003	0.37
rCBVvariation_mean of enhanced tumor	0.996	0.986	1.006	0.40
rCBVvariation_mean of whole tumor	0.992	0.984	1.001	0.07
rCBVvariation_max of nonenhanced tumor	1.000	0.998	1.002	0.82
rCBVvariation_max of enhanced tumor	1.000	0.998	1.001	0.75
rCBVvariation_max of whole tumor	1.001	0.999	1.002	0.57

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.