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Table 1 Summary of NTM positive and negative sampling site variables

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

  NTM Negative NTM Positive Significance (p value)
Sampling Site Factor (Mean ± SD)    
Site elevation (meters above sea level)* 44.75 ± 40.12 43.78 ± 39.99 0.977
S 44.94 ± 41.92 44.88 ± 38.86 0.680
W 43.51 ± 26.54 43.26 ± 40.63 0.751
Pipe Diameter (cm) 438.01 ± 459.91 435.21 ± 461.92 0.954
S 403.23 ± 417.56 489.15 ± 513.25 0.211
W 553.94 ± 571.58 409.59 ± 434.81 0.103
Mains Age (years) 46.56 ± 19.53 48.94 ± 19.15 0.246
S 46.15 ± 19.83 50.97 ± 17.74 0.091
W 47.91 ± 18.71 47.97 ± 19.77 0.987
Pipe material    
Asbestos cement 28 (30.8% 63 (69.2) 0.166
Cement lined† 77 (41.8) 107 (58.2)
PVC 6 (42.9) 8 (57.1)
Cast iron spun lined 30 (35.7) 54 (64.3)
Other‡ 7 (63.3) 4 (36.4)
Sample type N (%)    
Distribution 86 (37.1) 146 (62.9) 0.668
Reservoir 36 (39.1) 56 (60.9)
Trunk Main 26 (43.3) 34 (56.7)
Surface water source N (%)    
Mt Crosby 120 (38.6) 191 (61.4) 0.995
Pine 14 (37.8) 23 (62.2)
Mixed 14 (38.9) 22 (61.1)
  1. *Elevation non normally distributed, square root transformation to analyse.
  2. †Cast iron, ductile iron or mild steel cement lined.
  3. ‡Steel unlined/ polyethylene/unknown.