Table 4.
Mean Legionella concentration in three hospitals before and after the replacement of sensor-activated faucets with Thermostatic Mixer Valves (TMVs).
| ID Hospitals |
Number of SHWOs (Total Samples) |
Time of Renovation Works of SHWOs (Total Samples) |
Mean Temperature Samples (°C) |
Number of Legionella Positive Samples/Total of Samples (%) |
Number of Legionella Samples Over Risk Value/Positive Samples (%) |
Mean Legionella Concentration ± SD (Log cfu/L) |
t-Student and Wilcoxon Test p-Value (p) |
|---|---|---|---|---|---|---|---|
| 1 | 5 (28) | Before (14) | 42.73 | 1.98 ± 1.34 | 0.046 * | ||
| 5/28 (17.9) | 4/5 (80.0) | ||||||
| After (14) | 49.15 | 1.23 ± 0.13 | |||||
| 1/28 (3.6) | 0 | ||||||
| 8 | 3 (50) | Before (25) | 42.89 | 2.59 ± 1.34 | 0.001 * | ||
| 19/50 (38.0) | 13/19 (68.4) | ||||||
| After (25) | 46.98 | 1.3 ± 0.20 | |||||
| 5/50 (10.0) | 0 | ||||||
| 11 | 14 (32) | Before (16) | 48.96 | 3.03 ± 1.04 | 0.001 * | ||
| 15/32 (46.9) | 15/15 (100.0) | ||||||
| After (16) | 49.50 | 9/32 (28.1) | 5/9 (55.6) | 1.8 ± 0.86 |
* Values are statistically significant at p ≤ 0.05.