Table 2 Presence of pathogenic NTM against different variables
Variable | Pathogenic NTM | Non pathogenic NTM | P value |
|---|---|---|---|
Sample type | Â | Â | 0.001 |
Distribution | 203 | 129 | |
Reservoir | 56 | 75 | |
Treatment Plant | 33 | 41 | |
Surface water source | Â | Â | 0.695 |
Crosby | 231 | 195 | |
Mixed | 25 | 25 | |
Pine | 36 | 26 | |
Distance to nearest reservoir (km) Mean (±SD) | 4.46 (5.01) | 4.85 (6.18) | 0.423 |
Age of water mains (yrs) Mean (±SD) | 49.45 (19.50) | 49.03 (19.11) | 0.646 |
Pipe diameter (mm) Mean (±SD) | 360.82 (414.90) | 509.74 (503.47) | <0.0001 |
Site elevation | 43.26 (45.50) | 44.97 (37.17) | 0.638 |
Pipe material | Â | Â | Â |
Asbestos cement | 91 (62.3) | 55 (37.7) | 0.046 |
Cast iron cement lined | 26 (56.5) | 20 (43.5) | |
Cast iron spun lined | 68 (59.1) | 47 (40.9) | |
Ductile Iron cement lined | 14 (50) | 14 (50) | |
Mild steel cement lined | 75 (44.4) | 95 (55.9) | |
Mild steel unlined black | 3 (42.9) | 4 (57.1) | |
Modified PVC | 5 (88.3) | 1 (16.7) | |
Polyethylene | 0 | 1 (100) | |
Unplasticized PVC | 8 (61.5) | 5 (38.5) |