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Table 2 Matched univariate conditional logistic regression analysis of selected dichotomous risk factors among cases of giardiasis and matched controls, water-supply zone A, Bergen municipality 1/9 – 15/11 2004.

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

  Cases (%) (n = 27) Controls (%) (n = 54) Matched OR 95% CI p-value
Having children in household 8 33% 17 34% 1.2 0.3 – 4.5 0.8
Having dog/cat 8 30% 7 13% 5.3 1.0 – 26.6 0.04
Salad 20 87% 45 90% 0.7 0.2 – 3.3 0.7
Tomato 19 83% 44 85% 0.8 0.2 – 3.2 0.8
Cucumber 20 83% 41 82% 1.2 0.3 – 4.3 0.8
Raw leek 9 38% 9 18% 7.1 0.9 – 58.9 0.1
Mineralwater 11 42% 27 51% 0.6 0.2 – 1.8 0.4
Coffee 18 72% 28 52% 2.4 0.7 – 7.9 0.2
Beer 8 33% 8 15% 3.3 0.9 – 12.7 0.06
Water at home (>5 glass) 20 74% 12 22% 7.3 2.4 – 21.8 <0.01
Water at the gym 10 38% 8 15% 5.2 1.1 – 26 0.03
Water in cafe or restaurant 10 38% 13 25% 1.8 0.6 – 5.2 0.3
Drinking water at work 14 56% 24 45% 1.6 0.6 – 4.4 1.6
Supermarket A 22 88% 27 55% 6.5 1.4 – 29.2 <0.01
Supermarket B 12 52% 19 40% 1.2 0.4 – 3.5 0.7
  1. NOTE. CI, confidence interval; OR, odds ratio.