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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).