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Table 3 Risk factors for gastroenteritis in groups C and D, hotel X, Norway, March 2007

From: Investigation of Swedish cases reveals an outbreak of cryptosporidiosis at a Norwegian hotel with possible links to in-house water systems

 

Exposed

Non-exposed

RR

95% CI

p value (2-sided

Fisher's exact)

Percentage of

cases exposed

 

n/N

AR (%)

n/N

AR (%)

    

Group C (n = 22, N = 33)

        

Water from dispenser

18/21

(85)

2/7

(29)

3.0

0.9–9.8

<0.01

90

Ice cubes from the bar

19/24

(79)

1/3

(33)

2.4

0.5–11.9

0.2

95

Tap water

14/16

(88)

3/8

(38)

2.3

0.9–5.8

0.02

82

Broccoli soup*

21/24

(88)

0/4

(0)

8

-

<0.01

100

Bottled water (commercial)

7/13

(54)

9/10

(90)

0.6

0.4–1.0

0.1

44

Fruit

9/14

(64)

6/7

(86)

0.8

0.5–1.2

0.3

60

Combined Group C and D (n = 23, N = 43)

        

Water from dispenser

18/28

(64)

2/7

(29)

2.2

0.7–7.5

0.1

90

Ice cubes from the bar

19/24

(79)

1/9

(11)

7.1

1.1–45.7

<0.001

95

Tap water

14/22

(64)

3/10

(30)

2.1

0.8–5.8

0.1

82

Broccoli soup*

22/32

(69)

0/4

(0)

8

-

0.02

100

Bottled water (commercial)

7/15

(47)

9/15

(60)

0.8

0.4–1.5

0.5

44

Fruit

9/22

(41)

6/7

(86)

0.5

0.3–0.9

0.1

60

  1. n, case; N, total; AR, attack rate; RR, risk ratio; CI, confidence interval
  2. * Part of menu on 16 March; Different water dispensers were used by different groups