Methicillin-resistant staphylococcus aureus (MRSA) has become resistant to antibiotics. The purpose of this quantitative, retrospective cohort study was to examine the relationship between length of hospitalization and invasive MRSA infection rates among different racial and ethnic groups in the 8 service planning areas (SPAs) of Los Angeles County. Cane, O\u27Connor, and Michie\u27s theoretical domain framework was used. Secondary data from the Healthcare-Associated (HA) Infections Program of the California Department of Public Health were analyzed. For the first research question, a Pearson correlation analysis was conducted to assess the relationships between length of hospitalization and invasive HA-MRSA infection rates and counts. Length of hospital stay was not correlatedwith HA-MRSA infection rates; however, it was strongly and positively correlated with HA-MRSA infection counts. For the second research question, a one-way ANOVA was conducted on the infection count rate data, with SPA as the between-subjects factor. The results were statistically significant, indicating that HA-MRSA infection counts varied among the 8 SPAs. The findings might help medical professionals better understand the risk factors associated with MRSA infections. In doing so, findings may relieve some of the burden on the U.S. health care system and improve the overall quality of life of the patients involved
