TABLE 2

Summary of Performance Indicators for V/Q Scintigraphy and CTPA

	Scintigraphy
Indicator	V/Q (1)^*	V/Q (2)^†	CTPA
Sensitivity (%)	97.4	96.2	51.3
Specificity (%)	90	94.6	99.3
Accuracy (%)	92.5	95.2	82.8
NPV (%)	98.5	97.9	79.7
PPV (%)	83.5	90.3	97.6

↵* Intermediate with high-probability scans as indicative of CTEPH.
↵† Only high-probability scans as indicative of CTEPH.
NPV = negative predictive value; PPV = positive predictive value.