Volume 10, Number 3—March 2004
Research
Legionella Infection Risk from Domestic Hot Water
Table 5
Univariate analysis of water chemical parameters associated with microbiologic dataa
Chemical | Legionella spp. (yes/no) |
Pseudomonas spp. (yes/no) |
Total count at 36°C (high/low)b |
Total count at 22°C (high/low)b |
|
---|---|---|---|---|---|
OR (95% CI) | OR (95% CI) | OR (95% CI) | OR (95% CI) | ||
Cu ≥50 μg/L |
0.14c (0.02 to 1.13) |
0.99 (0.38 to 2.56) |
0.64 (0.24 to 1.68) |
0.71 (0.22 to 2.28) |
|
Zn <100 μg/L |
0.33d (0.14 to 0.76) |
1,21 (0.62 to 2.35) |
0.38d (0.19 to 0.75) |
0.29d (0.13 to 0.67) |
|
Fe <20 μg/L |
0.37c (0.16 to 0.85) |
1.96c (1.00 to 3.86) |
050c (0.25 to 0.97) |
0.74 (0.34 to 1.58) |
|
Mn <3 μg/L |
0.42c (0.19 to 0.94) |
1.50 (0.76 to 2.94) |
0.23e (0.11 to 0.45) |
0.31d (0.14 to 0.70) |
|
Hardness >25°F |
0.41c (0.18 to 0.89) |
3.91e (1.80 to 8.52) |
1.92(0.96 to 3.86) |
1.03 (0.47 to 2.26) |
|
Oxidizability >0.5 mg/L O2 |
0.42c (0.18 to 0.95) |
1.12 (0.52 to 2.42) |
1.01 (0.49 to 2.07) |
0.29d (0.12 to 0.68) |
|
Free Cl present | 0.51 (0.23 to 1.15 ) | 0.35d (0.17 to 0.73) | 1.52 (0.73 to 3.13) | 0.49 (0.22 to 1.09) |
aOR, odds ratio; CI, confidence interval.
bHigh >100 CFU/mL.
cp < 0.05.
dp < 0.01.
ep < 0.001.