TABLE 4.

Negative Predictive Values and Positive Predictive Values Calculated for Hypothetical Facilities with Different Prevalences of Methicillin-Resistant Staphylococcus aureus (MRSA) Colonization or Vancomycin-Resistant Enterococcus (VRE) Colonization in Patients at Admission Using Sensitivity and Specificity of the Prediction Rule, Electronic Medical Record Documentation of Antibiotic Use during the Past Year

Admission prevalence	Negative predictive value	Positive predictive value
MRSA colonization
1%	0.99	0.01
2.5%	0.96	0.04
5%	0.93	0.07
10%	0.94	0.14
10.4%	0.94	0.15
15%	0.91	0.21
VRE colonization
1%	0.99	0.02
2.5%	0.99	0.05
5%	0.99	0.09
6.3%	0.99	0.11
10%	0.98	0.17
15%	0.98	0.25