Table 2:

Performance of selected nontransformed (model A) and covariate transformed (model B) perfusion thresholds for tissue fate prediction in derivation and validation data bases

Perfusion Parameter	Derivation Data Base			Validation Data Base
Perfusion Parameter	Sens.	Spec.	Acc.	Sens.	Spec.	Acc.
CBF-GM-Rel
A) Without any covariate	0.88	0.89	0.88	0.72	1	0.82
B) With covariates	0.89	0.93	0.91	0.78	1	0.86
CBF-WM-Rel
A) Without any covariate	0.86	0.84	0.85	0.76	0.95	0.82
B) With covariates	0.90	0.80	0.86	0.79	0.91	0.83
Tmax-GM-Abs
A) Without any covariate	0.80	0.92	0.84	0.70	0.93	0.78
B) With covariates	0.84	0.96	0.88	0.69	0.97	0.79
Tmax-WM-Abs
A) Without any covariate	0.76	0.85	0.79	0.70	0.88	0.76
B) With covariates	0.80	0.80	0.80	0.64	0.94	0.76

Note:—Rel indicates relative to the contralateral side; Abs, absolute value; Sens, sensitivity; Spec, specificity; Acc, accuracy.