Table 3.

Sensitivities, Specificities, Positive Predictive and Negative Predictive Values for Phenotypic and HRMA (bla_SHV Gene for ESBL-Producing, bla_KPC Gene for Carbapenemase-Producing and bla_VIM Gene for MBL-Producing) Methods in β-Lactamase-Producing Strain of P. aeruginosa

Methods	No. of P. aeruginosa Strains (Total n = 88)
	KPC Strains (Total n = 12)				MBL Strains (Total n = 5)				ESBL Strains (Total n = 39)				Sen (%)	Sp (%)	PPV (%)	NPV (%)
	True Positive	False Positive	False Negative	True Negative	True Positive	False Positive	False Negative	True Negative	True Positive	False Positive	False Negative	True Negative
DDT	0	0	0	0	0	0	0	0	43	4	2	86	95.55	95.55	91.48	97.72
EIM assay	0	0	0	0	7	2	2	81	0	0	0	0	77.77	97.59	97.59	77.77
Hodge test	11	1	1	76	0	0	0	0	0	0	0	0	91.66	98.70	91.66	98.70
Carba-NP	19	4	2	74	0	0	0	0	0	0	0	0	90.47	94.87	97.36	82.60
HRM	12	0	0	76	5	0	0	83	39	0	0	69	100	100	100	100
Gold Standard	12	0	0	76	5	0	0	83	39	0	0	69	100	100	100	100

Abbreviations: Sen, sensitivity; Sp, speciation; PPV, positive predictive values; NPV, negative predictive values.