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.

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