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Table 2 Bivariable and final model of multivariable analysis of risk factors, 6 January 2008*.

From: Food-borne norovirus-outbreak at a military base, Germany, 2009

  Exposed Non-exposed   Bivariable Multivariable
Exposure Total Cases AR% Total Cases AR% AF/PF % RR 95% CI P aOR 95% CI P
Salad bar 50 9 18.0 56 2 3.6 80.2 5.0 1.1-22.2 0.02 8.1 1.5-45.4 0.02
Potatoes 39 1 2.6 57 10 17.5 585.2 0.2 0.0-1.1 0.02    
Schnitzel 49 1 2.0 51 10 19.6 861.3 0.1 0.0-0.8 0.01 0.1 0.0-1.4 0.09
Pasta 48 8 16.7 55 3 5.5 67.3 3.1 0.9-10.9 0.07 1.8 0.3-12.0 0.58
Fish 7 2 28.6 90 9 10.0 65.0 2.9 0.8-10.1 0.14    
Vegetables 26 1 3.9 68 10 14.7 282.1 0.3 0.0-1.9 0.14    
Contact to ill persons or vomit 28 1 3.6 78 10 12.8 259.1 0.3 0.0-2.1 0.17 0.2 0.0-1.8 0.15
Yoghurt 17 0 0.0 78 11 14.1 NC 0.0 ∞-∞ 0.10    
  1. AR = attack rate, RR = crude relative risk, CI = confidence intervall, AF/PF = attributable/preventable fraction, aOR = adjusted odds ratio
  2. * Norovirus outbreak at a military base, Germany, 2009. Retrospective cohort study among members of the headquarters company with risk of infection during lunch on 6 January (n = 106). Exposures only listed if P < 0.2, and if P < 0.05 in bold.