TABLE 3.
Comparison of University of Chicago Medical Center Methicillin-Resistant Staphylococcus aureus (MRSA) and Concordant MRSA, Excluding Patients Discharged within 3 Days of Their Culture Being Obtained, July 1, 2004, through June 30, 2005, and Calendar Years 2006 and 2007
| Year | CA-MRSA characteristica | University of Chicago Medical Center MRSA,a no./total (%) |
Concordant MRSA,a
no./total (%) |
P |
|---|---|---|---|---|
| July 1, 2004, to June 30, 2005 | Genotypic criterion for a CA-MRSA infection | 57/139 (41) | 57/93 (61) | .001 |
| CA-MRSA by CDC case definition | 15/139 (11) | 19/93 (20) | .04 | |
| 48-hour criterion for CA-MRSA infection | 72/139 (52) | 69/93 (74) | .001 | |
| 2006 | 48-hour criterion for CA-MRSA infection | 76/135 (56) | 215/292 (74) | <.001 |
| 2007 | 48-hour criterion for CA-MRSA infection | 53/85 (62) | 183/250 (73) | .06 |
note. Patients identified by University of Chicago Medical Center surveillance who were cultured less than 3 days prior to their discharge were not included because it is doubtful that the results were available in the paper medical record when International Classification of Diseases, Ninth Revision, Clinical Modification codes were generated for the hospital discharge. CA-MRSA, community-associated MRSA; CDC, Centers for Disease Control and Prevention.
For definitions of terms, see Table 1.