TABLE 1.

Patient criterion assignment

Criterion	Patient criterion assignment
	Positive	Negative	Excluded from analysis
30-Day criterion	Positive MRSA swab within 30 days of blood culture	Negative MRSA swab within 30 days of blood culture	No MRSA swab within 30 days of blood culture
Ever-positive criterion	Positive MRSA swab at any time before the blood culture	Negative MRSA swab within 30 days of blood culture	No MRSA swab result available at any time
Known-positive criterion	Positive MRSA swab at any time before the blood culture	Negative MRSA swab within 30 days of blood culture or no MRSA swab result available	Every patient is included