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Table 6 comparison in water quality indicators between intervention and non-intervention systems

From: Impact on diarrhoeal illness of a community educational intervention to improve drinking water quality in rural communities in Puerto Rico

Parameter Non-intervention (n = 41)   Intervention (n = 28)   P
  Mean Standard deviation Mean Standard deviation  
Turbidity 1.80 2.16 5.18 12.15 0.157a
pH 7.44 0.41 7.45 0.25 0.834a
Temp/°C 26.63 1.99 27.13 1.71 0.287a
Total chlorine 0.21 0.42 0.47 0.72 0.061a
Free chlorine 0.15 0.36 0.61c 0.98 0.026a
  Absent Present Absent Present  
Salmonella/L 8 13 6 8 0.778b
Total coliforms/100 ml 15 25 14 12 0.191b
E. coli/100 ml 27 13 18 8 0.883b
Faecal streptococci/100 ml 27 14 15 11 0.501b '
  1. a T test
  2. b Chi squared
  3. c Mean free chorine higher than mean total chlorine due to missing total chlorine results.