Table 2.

Coincidence between single phase-computed tomography pulmonary angiography (SP-CTPA) and dual phase-computed tomography pulmonary angiography (DP-CTPA) in the diagnosis of PE and the FCD.

	PE (n = 359)	Without PE (n = 660)	Overall 1,019	Sensitivity (95% CI)	Specificity (95% CI)	Positive predictive value	Negative predictive value	NRI
SP-CTPA				98.1% (96.6–99.5%)	78.5% (75.3–81.6%)	0.713	0.987	0.215*
positive	352	142	494
negative	7	518	525
DP-CTPA				98.1% (96.6–99.5%)	100.0%	1.000	0.990
positive	352	0	352
negative	7	660	667

NRI, net reclassification improvement; PE, pulmonary embolism;

^*z = 11.94, P < 0.05.