Table 2.

Prediction model characteristics at different points on the receiver operating characteristic curve

Sensitivity	Specificity	Positive predictive value	Negative predictive value	Positive likelihood ratio	Negative likelihood ratio
0.99	0.10	0.31	0.94	1.1	0.2
0.90	0.40	0.38	0.91	1.5	0.3
0.64	0.75	0.51	0.84	2.6	0.5
0.38	0.90	0.60	0.78	2.8	0.5
0.10	0.99	0.80	0.73	9.7	0.9

Values are presented for 90 and 99 percent sensitivity and specificity, as well as at Youden’s Index where there is optimal trade-off of sensitivity and specificity, assuming equal weighting of false positives and false negatives.