Table 4

Number of study participants, number admitted, sensitivity, specificity, predictive values and likelihood ratios at cut-points of 0.1 increments for the original and modified Pra

Cut-point	Number of participants (n)	≥1 emergency admission (n)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	LR+	LR−
Original Pra
≥0	2	0	100	0	18	–	1.0	–
≥0.1	77	2	100	0	18	100	1.0	0.0
≥0.2	365	50	99	11	20	97	1.1	0.1
≥0.3	219	43	66	56	25	88	1.5	0.6
≥0.4	132	33	38	81	30	86	2.0	0.8
≥0.5	50	18	17	95	41	84	3.2	0.9
≥0.6	12	7	5	99	62	83	7.3	1.0
≥0.7	1	1	1	100	100	82	–	1.0
≥0.8	0	0	0	100	–	82	–	1.0
≥0.9	0	0	0	100	–	82	–	1.0
Modified Pra
≥0	0	0	100	0	18	–	1.0	–
≥0.1	4	1	100	0	18	–	1.0	–
≥0.2	118	11	99	0	18	75	1.0	1.5
≥0.3	184	16	81	16	19	90	1.1	0.5
≥0.4	165	23	81	39	49	90	1.3	0.5
≥0.5	190	38	67	59	26	89	1.6	0.6
≥0.6	141	39	42	81	32	87	2.2	0.7
≥0.7	57	24	17	95	43	84	3.5	0.9
≥0.8	3	2	1	100	67	82	9.2	1.0
≥0.9	0	0	0	100	–	82	–	1.0

LR, likelihood ratio; NPV, negative predictive value; PPV, positive predictive value; Pra, Probability of repeated admission.