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)
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) |