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Table 3 Comparison of possible confounding nominal variables between control and intervention systems,

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

   Intervention Control P
Gender M 647 592 0.118
  F 639 662  
Education of main bread winner Elementary or less 96 95 0.192
  Secondary 254 195  
  High education 134 130  
Problems with sewage N 441 397 0.056
  Y 41 22  
Problems with neighbours sewage N 446 385 0.755
  Y 34 27  
Dogs N 185 194 0.014
  Y 300 226  
Cats N 341 312 0.204
  Y 144 109  
Rabbits N 41 18 0.01
  Y 443 404  
Cattle N 30 24 0.739
  Y 454 399  
Sheep N 6 6 0.811
  Y 479 417  
Goats N 10 8 0.854
  Y 475 415  
Pigs N 24 24 0.626
  Y 461 399  
Birds N 187 134 0.029
  Y 297 289  
Horses N 54 48 0.909
  Y 431 374