Table 3.

Concordance between nasal and diabetic foot ulcer Staphylococcus aureus (SA) and Methicillin-resistant Staphylococcus aureus (MRSA) colonization (N=79)

	Ulcer SA+	Ulcer SA−	Total
Nasal SA+	12	13	25	Positive Predictive Value = 48.0
Nasal SA−	17	37	54	Negative Predictive Value = 68.5
Total	29	50	79
	Sensitivity = 41.4	Specificity = 74.0
	Ulcer MRSA+	Ulcer MRSA−	Total
Nasal MRSA+	3	4	7	Positive Predictive Value = 42.9
Nasal MRSA−	4	68	72	Negative Predictive Value = 94.4
Total	7	72	79
	Sensitivity = 42.9	Specificity = 94.4