Environmental Contaminants in Hospital Settings and Progress in Disinfecting Techniques
Table 2
Number of CFUs in H(0) samples from the four hospital units: median, interquartile range (IQR), mean and standard deviation value comparing data of the four units by the Mann-Whitney test.
Culture medium
(A): cardiology and hemodynamic, 33 objects
(B): first aid, 25 objects
(C): intensive care unit, 29 objects
(D): emergency unit, 12 objects
value comparing data of the four units by the Mann-Whitney test
Median (IQR)
Mean (SD)
Median (IQR)
Mean (SD)
Median (IQR)
Mean (SD)
Median (IQR)
Mean (SD)
A versus B
A versus C
A versus D
B versus C
B versus D
C versus D
TBC 36*
9 (4 to 27)
63.0 (157.6)
24 (8 to 39)
41.52 (86.9)
2 (0 to 12)
6.96 (9.8)
7 (2.5 to 10)
100.6 (318.1)
0.136
0.005
0.232
0.0007
0.073
0.224
TBC 22
9 (3 to 26)
63.7 (170.5)
27 (5 to 41)
37.2 (69.8)
2 (0 to 9)
6.14 (11.2)
6 (0.5 to 17)
133.8 (432.9)
0.095
0.002
0.233
0.0001
0.066
0.181
E. coli
0 (—)
1.7 (6.6)
0 (0 to 1)
0.4 (0.8)
0 (—)
0.03 (0.2)
0 (—)
6.1 (20.5)
0.048
0.035
0.058
0.011
0.043
0.089
Coliforms
1 (0 to 5)
19.9 (68.5)
8 (5 to 14)
11.8 (13.6)
0 (0 to 2)
1.4 (2.8)
1.5 (0 to 9)
29.8 (90.1)
0.008
0.006
0.680
<0.001
0.088
0.128
Staphylococci
5 (2 to 14)
44.7 (145.5)
12 (3 to 25)
23.7 (36.6)
2 (0 to 3)
4.8 (13.0)
6.5 (2.5 to 9.5)
88.7 (288.0)
0.01
0.002
0.533
0.006
0,101
0.041
MRSA**
0 (—)
3 (10.0)
0 (0 to 2)
2.0 (4.5)
0 (—)
0.2 (0.7)
0 (0 to 5)
2.3 (3.2)
0.088
0.114
0.093
0.004
0.459
0.003
Moulds
0 (0 to 1)
1.4 (4.1)
0 (0 to 3)
2.4 (4.3)
0 (—)
0.07 (0.3)
0 (0 to 1.5)
3.8 (8.9)
0.224
0.004
0.551
0.001
0.317
0.082
TBC 36 and TBC 22: total bacterial count incubating at 36°C and 22°C, respectively; **MRSA: methicillin-resistant Staphylococcus aureus.
