Table 3.

Performance of the models for predicting CRKP infection at different cutoff values.

No. of risk factors	TP	FP	TN	FN	Se (%)	Sp (%)	PPV (%)	NPV (%)	Acc (%)
Derivation cohort
⩾1	244	256	7	0	100	3	49	100	50
⩾2	244	235	28	0	100	11	51	100	54
⩾3	244	215	48	0	100	18	53	100	58
⩾4	233	183	80	11	96	30	56	88	62
⩾5	219	120	143	25	90	54	65	85	71
⩾6	200	68	195	44	82	74	75	82	78
⩾7	175	31	232	69	72	88	85	77	80
⩾8	147	18	245	97	60	93	89	72	77
⩾9	110	11	252	134	45	96	91	65	71
⩾10	56	5	258	188	23	98	92	58	62
⩾11	30	3	260	214	12	99	91	55	57
⩾12	15	0	263	229	6	100	100	53	55
⩾13	6	0	263	238	3	100	100	52	53
Validation cohort
⩾1	147	183	5	0	100	3	45	100	45
⩾2	147	176	12	0	100	6	46	100	47
⩾3	147	166	22	0	100	12	47	100	50
⩾4	143	141	47	4	97	25	50	92	57
⩾5	136	96	92	11	93	49	59	89	68
⩾6	126	57	131	21	86	70	69	86	77
⩾7	113	31	157	34	77	84	78	82	81
⩾8	94	20	168	53	64	89	82	76	78
⩾9	67	13	175	80	46	93	84	69	72
⩾10	27	7	181	120	18	96	79	60	62
⩾11	12	3	185	135	8	98	80	58	59
⩾12	6	0	188	141	4	100	100	57	58
⩾13	2	0	188	145	2	100	100	56	57

TP: number of true positives; FP: number of false positives; FN: number of false negatives; TN: number of true negatives; Se: sensitivity; Sp: specificity; PPV: positive predictive value; NPV: negative predictive value; Acc: rate of accuracy of the risk score model.