Table 4.

Comparison of the diagnostic value of DWI-FLAIR mismatch after consensus review between realFLAIR and synthFLAIR to estimate stroke onset time within 4.5 h.

Statistic	realFLAIR	synthFLAIR	p Value
Sensitivity	60/71 (85)	59/71 (83)	0.56
Specificity	65/70 (93)	65/70 (93)	>0.99
Positive predictive value	60/65 (92)	59/64 (92)	0.97
Negative predictive value	65/76 (86)	65/77 (84)	0.57

Diagnostic value was computed in the 141 MRI datasets when stroke onset-to-MRI delay was available. Data are expressed as number of MRI sets, with corresponding percentages in parentheses. Sensitivity and specificity were compared using the McNemar test. Predictive values were compared using the relative predictive value method.