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Table 5 Mean levels of microbial accumulation (TVC at 36°C, cfu/cm2) of operative surfaces (countertops and swiches), prevalence of samples with levels above the threshold level (1 cfu/cm2)

From: Italian multicenter study on infection hazards during dental practice: Control of environmental microbial contamination in public dental surgeries

  Countertops Switches
  T0 T1 Stat. anal. T0 T1 Stat. anal.
Logarithmic mean 0.01 (se = 0.08) 0.12 (se = 0.08) t = 1.10 (p = 0.27) -0.15 (se = 0.09) 0.005 (se = 0.09) t = 1.23 (p = 0.22)
Geometric mean 1.0 1.3   0.7 1.0  
% positives 51.4 (57/111) 54.1 (60/111) McN = 0.31 (p = 0.58) 48.2 (53/110) 52.7 (57/110) McN = 1.8 (p = 0.18)