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. 2014 Jul 16;14:394. doi: 10.1186/1471-2334-14-394

Table 4.

Risk factors associated with Legionella isolation in univariate analysis

Risk factors
Parameters
Legionella isolation no. (%)
 
    Yes No OR 95% CI p-value
Water temperature°C
≥20°C - ≤ 45°C
48 (13.3)
314 (86.7)
1.98
1.30 - 3.03
< 0.001
vs.
<20°C or > 45°C
47 (7.2)
609 (92.8)
Residual free chlorine concentration mg/L
< 0.5
90 (12.9)
610 (87.1)
5.3
2.63 - 10.65
< 0.001
vs.
≥ 0.5
9 (2.7)
323 (97.3)
Potability of water according to regulation
Not potable water
9 (25.0)
27 (75.0)
4.48
1.87 - 10.74
0.001
vs.
Potable water
21 (6.9)
282 (93.1)
No continuous vs. continuous hyperchlorination
No continuous hyperchlorination
15 (27.3)
40 (72.7)
6.41
3.10 - 13.26
< 0.001
vs.
Continuous hyperchlorination
23 (5.5)
393 (94.5)
Before vs. shock hyperchlorination at 15 days
Before shock hyperchlorination
43 (21.1)
161 (78.9)
3.17
1.70 - 5.92
< 0.001
vs.
Shock hyperchlorination at 15 days
15 (7.8)
178 (92.2)
Before vs. shock hyperchlorination at 30 days
Before shock hyperchlorination
43 (21.1)
161 (78.9)
7.43
3.08 - 17.94
< 0.001
vs.
Shock hyperchlorination at 30 days
6 (3.5)
167 (96.5)
Before vs. continuous hyperchlorination
Before shock hyperchlorination
43 (21.1)
161 (78.9)
4.56
2.66 - 7.82
< 0.001
vs.
Continuous hyperchlorination
23 (5.5)
393 (94.5)
Continuous vs. shock hyperchlorination at 30 days
Continuous hyperchlorination
23 (5.5)
393 (94.5)
1.63
0.65 - 4.07
0.15
vs. Shock hyperchlorination at 30 days 6 (3.5) 167 (96.5)