Table 1

Mean levels and standard errors (se) of TVC at 22° and 36°C (CFU/mL) from water samples, prevalence of samples with microbial levels above the threshold levels established by Italian law (21) (no samples exceeded the CDC 2003 threshold value).

Cup fillers


22°C

36°C



T0

T1

Statist. anal.

T0

T1

Statist. anal.


Logarithmic mean

1.6 (se = 0.15)

1.3 (se = 0.14)

t = 1.38 (p = 0.16)

1.7 (se = 0.15)

1.2 (se = 0.13)

t = 2.24 (p = 0.02)

Geometric mean

42.7

21.9

47.9

17.4

% positives (Italian law)

41.2 (42/102)

36.2 (37/102)

McN = 1.71 (p = 0.19)

60.8 (62/102)

47.0 (48/102)

McN = 10.32 (p = 0.001)


Air-water syringes


22°C

36°C



T0

T1

Statist. anal.

T0

T1

Statist. anal.


Logarithmic mean

1.8 (se = 0.15)

1.4 (se = 0.14)

t = 2.11 (p = 0.03)

1.7 (se = 0.13)

1.2 (se = 0.13)

t = 2.55 (p = 0.01)

Geometric mean

64.6

23.4

49.0

16.6

% positives (Italian law)

48.9 (47/96)

31.6 (30/95)

McN = 13.14 (p = 0.0003)

63.5 (61/96)

46.3 (44/95))

McN = 13.14 (p = 0.0002)


Tap water


22°C

36°C



T0

T0


Logarithmic mean

0.5 (se = 0.07)

0.7 (se = 0.10)

Geometric mean

3.0

5.4

% positives (Italian law)

4.4 (4/91)

29.3 (27/91)


Statistical analysis of differences between T0 and T1 (t-test for paired samples for means and McNemar test for proportions)

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

Open Data