Impacts of MRSA and MSSA BSI on 30-day mortalitya

Type of analysisNOR for effect measure (CI)Effect measure and potential confounders in model
MRSA vs controls
    Univariate6614.8 (3.2-7.1)BSI with MRSA
    Multivariate5334.4 (2.8-7.0)BSI with MRSA, central venous catheter, peripheral vascular access, urinary catheter, >2 admissions in the previous yr, Charlson Comorbidity Index, and no. of indwelling devices
MSSA vs controls
    Univariate1,6143.3 (2.5-4.3)BSI with MSSA
    Multivariate1,5902.4 (1.7-3.3)BSI with MSSA, emergency admission, central venous catheter, urinary catheter, nasogastric tube, no. of indwelling devices
MRSA cohort vs MSSA cohort, comparison of multivariate effect estimates1.8 (1.04-3.2)Methicillin resistance of S. aureus BSI
  • a Univariate and multivariate logistic regression and comparison of multivariate effect estimates from both cohorts.