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Table 3 Risk of giardiasis associated with quantity of water consumed among residents in water zupply zone A, Bergen municipality 1/9 – 15/11 2004. Group matched analysis by sex and 10-year age groups (83 cases, 54 controls).

From: A large community outbreak of waterborne giardiasis- delayed detection in a non-endemic urban area

Water intake Cases % Controls % OR* 95% CI
< 1 glass 1 1 % 4 7 % Ref -
1 – 2 glasses 8 10 % 11 20 % 3.2 0.2 – 69.5
3 – 5 glasses 23 28 % 27 50 % 4.8 0.4 – 64.7
more than 5 glasses 51 61 % 12 22 % 7.4 1.2 – 44.5
  1. * chi-square test for linear trend: 19.7; p < 0.001.