Performance of Quantification of Modified Hodge Test: An Evaluation with Klebsiella pneumoniae Carbapenemase-Producing Enterobacteriaceae Isolates

Table 4

Positive predictive values (PPV) and negative predictive values (NPV) of the quantitative Modified Hodge Test, according to estimated population prevalence of bla _KPC-2.

Population prevalence of bla KPC-2	MEM		ERT
	PPV (95% CI)	NPV (95% CI)	PPV (95% CI)	NPV (95% CI)
10%	97.3% (87.8–99.4%)	99.6% (98.5–99.9%)	94.7% (83.8–98.4%)	99.6% (98.5–99.9%)
20%	98.8% (94.2–99.8%)	99.0% (96.7–99.7%)	97.6% (92.1–99.3%)	99.0% (96.7–99.7%)
30%	99.3% (96.5–99.9%)	98.3% (94.5–99.5%)	98.6% (95.2–99.6%)	98.3% (94.5–99.5%)
50%	99.7% (98.0–99.9%)	96.1% (88.0–98.8%)	99.4% (97.9–99.8%)	96.1% (88.0–98.3%)
70%	99.9% (99.3–100%)	91.4% (75.9–97.3%)	99.7% (99.1–99.9%)	91.4% (75.9–97.3%)

MEM: meropenem; ERT: ertapenem.