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Table 2 Estimated effect of cleaning protocol on colony counts: manual cleaning vs portable pulsed ultraviolet machine cleaning (N = 20 rooms)

From: Evaluation of a pulsed-xenon ultraviolet room disinfection device for impact on contamination levels of methicillin-resistant Staphylococcus aureus

Type of colonies Regression coefficient (beta) 95% CI for beta Incident rate ratio (exp(beta)) 95% CI for IRR Chi-square statistic Pr
MRSA       
Baseline count 0.004 <0.0-0.001 --   3.24 0.07
Manual cleaning 2.0 0.2-3.7 7.2 1.3-41.4 4.91 0.03
HPC    --    
Baseline count 0.002 <0.0-0.01    1.49 0.22
Manual cleaning 2.6 1.3-3.8 12.9 3.5-47.8 14.7 <.01