Table 5.

Prediction of coronary stenosis by severity score at different cut-offs for total population (n = 423, a priori probability of stenosis = 0.475).

	TP	TN	FP	FN	Sens	Spec	PPV	NPV	Correct	OR	OR 95% CI
											Lower	Upper
Cut-Off 2.0	193	91	131	8	0.960	0.410	0.572	0.926	0.671	16.76	7.87	35.69
Cut-Off 2.5	191	109	113	10	0.950	0.491	0.605	0.923	0.709	18.42	9.26	36.66
Cut-Off 3.0	187	128	94	14	0.930	0.577	0.643	0.910	0.745	18.19	9.93	33.30
Cut-Off 3.5	183	152	70	18	0.910	0.685	0.703	0.903	0.792	22.08	12.60	38.68
Cut-Off 4.0	179	180	42	22	0.891	0.811	0.794	0.900	0.849	34.87	20.00	60.79
Cut-Off 4.5	146	186	36	55	0.726	0.838	0.786	0.789	0.785	13.72	8.55	22.01
Cut-Off 5.0	129	189	33	72	0.642	0.851	0.780	0.744	0.752	10.26	6.42	16.40

TP = true positives; TN = true negatives; FP = false positives; FN = false negatives; correct = fraction of correctly predicted cases; Sens = sensitivity; Spec = specificity; PPV = positive predictive value; NPV = negative predictive value; OR = odds ratio; 95% CI = 95% confidence interval; Lower = Lower boundary of 95% CI; Upper = Upper boundary of 95% CI