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Table 3 Mean levels of air contamination assessed by IMA (TVC at 36°C, cfu/plate), prevalence of samples with microbial levels above the threshold level (25 CFU/plate)

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 0.8 (se = 0.11) 1.4 (se = 0.07) t = 4.48 (p < 0.0001)
Geometric mean 6.5 23.4  
% positives 12.5 (4/32) 56.2 (18/32) McN = 12.07 (p = 0.0005)