Table 4.

Reclassification table comparing the RF-CL and CACS-CL models.

	Risk groups by CACS-CL model			Reclassificationa		NRIb	p
	Low	High	Total	Up	Down
Risk groups by RF-CL model
Negative patients				1.29%	25.39%	34.32%	<0.0001
Low	455	9	464
High	177	56	233
Total	632	65	697
Positive patientsc				11.13%	0.91%
Low	57	61	118
High	5	425	438
Total	62	486	548

RF-CL, risk factor-weighted clinical likelihood; CACS-CL, coronary artery calcium score-weighted clinical likelihood; CAD, coronary artery disease.

^a The classification of patients by the CACS-CL model was compared with that by the RF-CL model.

^b NRI = [P(Up | Positive) − P(Down | Positive)] − [ P(Up | Negative) − P(Down | Negative)].

^c A positive patient was defined as a patient who had obstructive CAD.