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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.