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Table 1 Number of environmental MSSA and MRSA isolates, number of new MRSA infections, total and average MRSA patient-days and bed occupancy rates for Wards A and B for two 6-month periods with and without enhanced cleaning.

From: Measuring the effect of enhanced cleaning in a UK hospital: a prospective cross-over study

  WARD A   WARD B    
  Routine Extra
Clean
Routine Extra
Clean
P-values Overall difference between extra clean and routine (adjusting for ward)
No. of environmental MSSA 8 20 22 17 P = 0.37 OR1 = 1.25
(0.76, 2.06)
No. of environmental MRSA 9 6 7 6 P = 0.45 OR1 = 0.75
(0.35, 1.59)
Mean ACC cfu cm2 33.8 31.2 33.4 18.6 P < 0.0001 Reduction2 = 32.5%
(20.2, 42.9)%
Total no. of sites with ACCs >2.5 cfu cm2 (hygiene fails) 86 73 82 27 P < 0.001 OR1 = 0.50
(0.37, 0.66)
Total no. of new patient MRSA infections 7 3 2 1 P = 0.032 RR3 = 0.26
(0.08, 0.92)
Average bed occupancy rates 89.7% 90.5% 85.7% 91.8% P = 0.42 Difference5 = 3.5%
(-1.7, 8.6)%
Total MRSA patient-days 232 271 95 204 P = 0.44 Ratio4 = 1.58
(0.87, 2.88)
Average weekly MRSA patient-days 8.92 10.42 3.65 7.84 As row above As row above
  1. 1 Odds ratio of enhanced cleaning relative to routine cleaning
  2. 2 Percentage reduction in total growth when there was enhanced cleaning relative to routine cleaning
  3. 3 Relative risk of a new MRSA acquisition when there was enhanced cleaning relative to routine cleaning
  4. 4 Ratio of total MRSA patient days when there was enhanced cleaning relative to routine cleaning
  5. 5 Difference in bed occupancy percentages when there was enhanced cleaning compared with routine cleaning
  6. MRSA = meticillin-resistant Staphylococcus aureus; ACC = aerobic colony count