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Table 2 Observed prevalence and incidence for the study data

From: Assessing the role of undetected colonization and isolation precautions in reducing Methicillin-Resistant Staphylococcus aureustransmission in intensive care units

Warda Monthly MRSA
prevalenceb
Mean (SD)
Monthly MRSA
admission prevalencec
Mean (SD)
Monthly MRSA incidence density (new cases per 1,000 patient days)
Mean (SD)
M1 16.9 (4.0) 12.6 (3.0) 8.8 (8.1)
M2 23.5 (4.7) 20.6 (3.3) 5.8 (5.8)
GS1 20.5 (5.8) 15.4 (4.2) 9.3 (8.3)
GS2 19.5 (6.4) 10.9 (4.1) 18.2 (9.7)
SS1 21.1 (8.7) 12.9 (7.5) 9.8 (10.1)
SS2 13.8 (4.4) 7.3 (2.8) 6.8 (4.9)
SS3 10.7 (3.9) 6.3 (3.6) 9.4 (7.9)
SS4 9.2 (3.3) 4.5 (3.1) 9.1 (6.1)
  1. a Here M denotes Medical or Cardiac ICU, GS denotes General Surgical ICU, including trauma and burn patients, SS denotes Specialty Surgical ICU.
  2. b The number of ICU patients ever known to be MRSA-positive before or during that month, divided by the total number of ICU patients that month.
  3. c The number of patients ever known to be MRSA positive before or within two calendar days of admission, divided by the total number of monthly admissions.