. 2015 Jan 23;57(5):469–474. doi: 10.1007/s00234-015-1486-8

Table 2.

Test characteristics of visual CT perfusion assessment for diagnosing DCI

	Tracer delay	Sensitivity (95 % CI)	Specificity (95 % CI)	PPV (95 % CI)	NPV (95 % CI)
Observer 1 (experienced)	Sensitive^a	0.73 (0.55–0.87)	0.67 (0.49–0.81)	0.67 (0.49–0.81)	0.73 (0.55–0.87)
Observer 1 (experienced)	Insensitive^b	0.72 (0.53–0.86)	0.68 (0.50–0.82)	0.66 (0.48–0.81)	0.74 (0.56–0.87)
Observer 2 (less experienced)	Sensitive^a	0.64 (0.45–0.80)	0.62 (0.45–0.78)	0.60 (0.42–0.76)	0.66 (0.48–0.81)
Observer 2 (less experienced)	Insensitive^b	0.55 (0.36–0.72)	0.68 (0.50–0.82)	0.60 (0.41–0.77)	0.63 (0.46–0.77)

DCI delayed cerebral ischemia, 95 % CI 95 % confidence interval, PPV positive predictive value, NPV negative predictive value

^aTracer delay sensitive is first moment mean transit time (fMTT)

^bTracer delay insensitive is block-circulant singular value decomposition (bSVD)