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Table 4 Dose-response-relationship between number of days of salad consumption and risk of disease*.

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

Salad consumption Total Cases AR% OR 95% CI P
None 44 2 4.5 reference   
On any one day 14 2 14.3 3.5 0.4-28.8 0.21
On any two days 11 3 27.3 7.9 1.0-62.2 0.02
On all three days 26 11 42.3 15.4 2.4-97.5 0.00
  1. AR = attack rate, OR = odds ratio, CI = confidence interval
  2. *Norovirus-outbreak at a military base, Germany, 2009. Retrospective cohort study among members of the headquarters company eating every lunch at the military base's canteen between 5-7 January (n = 95).