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Table 4 Attack rates of gastroenteritis by amount of food consumed by Nordic patients and workers with onset on 2 and 3 November, 2002 at the health centre (n = 91) in Gran Canaria, Spain.

From: Gastro-enteritis outbreak among Nordic patients with psoriasis in a health centre in Gran Canaria, Spain: a cohort study

Food item and dose Ill Not ill. AR RR (95%CI) X2 trend
Dried fruit, not eaten 8 58 12 Ref  
Dried fruit, eaten once 3 4 43 3.5 (1.2–10.4)  
Dried fruit, eaten twice or more 6 8 43 3.5 (1.5–8.6)  
Strawberry jam, not eaten 9 57 14 Ref.  
Strawberry jam, eaten once 2 6 25 1.8 (0.5–7.0)  
Strawberry jam, eaten twice or more 6 8 43 3.1 (1.3–7.4) 6.46 (p = 0.01)