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Table 1 Bivariable analysis of risk factors*.

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

  Exposed Non-exposed   Bivariable
Exposure Total Cases AR% Total Cases AR% AF% RR 95% CI P
Eating any meal at canteen 133 25 18.8 45 2 4.4 76.4 4.3 1.1-17.4 0.02
Eating any breakfast at canteen 62 9 14.5 116 18 15.5 -6.9 0.9 0.5-2.0 0.88
Eating any lunch at canteen 125 25 20.0 53 2 3.8 81.2 5.2 1.3-21.3 0.01
Eating any dinner at canteen 49 9 18.4 129 18 14.0 24.1 1.3 0.6-2.7 0.49
Contact to ill persons or vomit 35 8 22.9 143 19 13.3 41.9 1.7 0.8-3.6 0.17
Staying at military base overnight 67 11 16.4 108 16 14.8 9.8 1.1 0.6-2.2 0.78
  1. AR = attack rate, RR = relative risk, CI = confidence intervall, AF = attributable fraction
  2. *Norovirus outbreak at a military base, Germany, 2009. Retrospective cohort study among members of the headquarters company with risk of infection between 5-7 January (n = 178). Exposures with P < 0.05 in bold.