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Table 4 Mean levels of air contamination assessed by SAS (TVC at 36°C, CFU/m3), prevalence of samples with microbial levels above the threshold level (180 CFU/m3)

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

  T0 T1 Statistical analysis
Logarithmic mean 2.0 (se = 0.05) 2.0 (se = 0.07) t = 0.11 (p = 0.91)
Geometric mean 104.7 107.2  
% positives 39.1 (18/46) 34.8 (16/46) McN = 0.75 (p = 0.39)