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Table 2 Results of the cohort study: attack rates among those exposed and not-exposed to various food items on 5–7 August, relative risk as measure of association

From: Protracted outbreak of S. Enteritidis PT 21c in a large Hamburg nursing home

Date, meal, food item

Exposed

Not exposed

RR

95% CI

AF

 

ill

not ill

AR (%)

ill

not ill

AR (%)

   

Cohort from units 1 and 9, n = 181 (variable denominator due to missing data), only those with RR>2 shown:

   5-Aug, lunch, "light meal"

10

63

15.9

9

118

7.6

2.08

0.89–4.86

28%

   5-Aug, afternoon, cake

17

128

13.3

2

53

3.8

3.52

0.84–14.70

64%

   6-Aug, lunch, "light meal"

11

47

23.4

8

134

6.0

3.92

1.68–9.15

43%

   6-Aug, afternoon, cake

17

125

13.6

2

56

3.6

3.81

0.91–15.93

66%

   6-Aug, dinner, cold cuts

16

116

13.8

3

65

4.6

2.99

0.91–9.87

56%

   7-Aug, afternoon, cake

16

125

12.8

3

56

5.47

2.39

0.73–7.87

49%

Cohort from units 1, 2, 4 and 9, n = 378 (variable denominator due to missing data), all food items shown:

   5-Aug, afternoon, cake

38

306

13.3

4

70

5.7

2.17

0.80–5.89

49%

   6-Aug, afternoon, cake

38

303

13.3

4

69

5.5

2.29

0.84–6.21

51%

   7-Aug, afternoon, cake

37

303

12.2

5

68

6.8

1.78

0.73–4.38

39%

   6-Aug, lunch, "light meal"

20

123

16.3

22

253

8.7

1.87

1.06–3.29

22%

  1. AR, attack rate; AF, attributable fraction