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)


Castiglia et al. BMC Public Health 2008 8:187   doi:10.1186/1471-2458-8-187

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