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Table 2 Presence of pathogenic NTM against different variables

From: Factors associated with the isolation of Nontuberculous mycobacteria (NTM) from a large municipal water system in Brisbane, Australia

Variable Pathogenic NTM Non pathogenic NTM P value
Sample type    0.001
Distribution 203 129
Reservoir 56 75
Treatment Plant 33 41
Surface water source    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    
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)