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Table 2 Comparison of possible confounding scalar 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
  N Mean Std Dev N Mean Std Dev  
Children in house 485 0.55 0.89 423 0.65 0.967 0.095
Adults in house 485 2.11 1.04 423 2.33 1.14 0.002
How long lived at address 481 29.4 21.9 415 30.7 22.9 0.407
How many bedrooms 485 2.98 0.97 423 2.93 0.9 0.443
How many working cars 485 1.42 1.06 423 1.47 1.18 0.449
Crowding 484 0.95 0.57 420 1.05 0.54 0.007
Size of system 485 171.61 91.74 423 65.98 20.22 1.7 × 10-90
Age 1288 37.9 22.8 1242 37.1 22.9 0.43