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)
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) |