TABLE 2.

Sensitivity, specificity, negative predictive value, positive predictive value, and number of different screening groups needed to treat among patients for whom clinical culture of a sample was performed and who received antibiotics in the first 48 h of admission

Group	Sensitivity (%)	Specificity (%)	Positive predictive value (%)	Negative predictive value (%)	No. needed to treat
Screening question answers “yes” and MRSA surveillance test positive	40.5	95.2	29.7	97.0	3
Screening question answers “yes” and MRSA surveillance test negative	35.8	49.3	3.4	93.9	29
Screening question answers “no” and thus not tested for MRSA	23.7	55.5	2.6	93.6	38