Table 2.

SHERPA predictive performance in 2009 cohort (4 categories)

SHERPA category cut-off	positive test, %	Se, %	Sp, %	PPV, %	NPV, %	+ LR	-LR
>1	69	79	37	78	39	1.25	0.57
>2	40	53	67	74	45	1.61	0.70
>3	18	28	88	71	54	2.3	0.82

Se Sensitivity, Sp Specificity, PPV Positive Predictive value, NPV Negative Predictive value, +LR positive likelihood ratio, −LR negative likelihood ratio