Table 3.

Risk score performance in the derivation cohort (data shown are percentages)

Score	Proportion of patients	SE	SP	PPV	NPV	AC	PLR	NLR
≥4	83	99	20	22	99	35	1.23	0.05
≥5	82	99	22	22	99	36	1.26	0.04
≥6	76	99	29	24	99	42	1.39	0.03
≥7	67	97	39	27	98	50	1.59	0.07
≥8	55	90	54	31	96	60	1.95	0.18
≥9	51	89	58	32	96	63	2.11	0.18
≥10	46	87	63	35	95	68	2.35	0.20
≥11	32	79	78	46	94	79	3.59	0.26
≥12	29	77	83	50	94	81	4.52	0.27
≥13	23	67	86	53	92	83	4.78	0.38
≥14	19	56	89	54	90	83	5.09	0.49
≥15	13	47	95	69	88	86	9.4	0.55
≥16	11	43	96	72	88	86	10.75	0.59
≥17	7	28	97	71	85	85	9.33	0.74
≥18	3	15	99	81	83	84	15.00	0.85
≥19	3	12	99	82	83	83	12.00	0.90
≥20	1	4	100	83	82	82	–	0.96

SE, sensitivity; SP, specificity; PPV, positive predictive value; NPV, negative predictive value; AC, accuracy; PLR, positive likelihood ratio; NLR, negative likelihood ratio.