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Table 3 Food specific attack rates (AR) (uni – and multivariable analysis¤) for pooled food items (food pooled from October 31-November 2) among Nordic patients and workers ill 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 Food eaten Food not eaten Univariable   Multivariable
  Cases N = 17 Total* AR% Cases Total* AR% RR 95% C.I % cases exposed RR 95% C.I
Strawberry jam 8 24 33 9 63 14 2.3 1.0–5.3 47 1.9 0.9–4.1
Butter 7 28 25 10 59 17 1.5 0.6–3.5 41   
Dried fruit 9 21 43 8 66 12 3.5 1.6–8.0 53 3.1 1.4–7.1
Apple 5 25 20 12 62 19 1.0 0.4–2.6 29   
Pear 6 17 35 11 70 16 2.3 1.0–5.2 35   
Full milk 4 10 40 13 77 17 2.4 1.0–5.7 24   
Kiwi 5 21 24 12 66 18 1.3 0.5–3.3 29   
  1. 4 responders did not remember what they ate
  2. ¤ Variables controlled for in the multivariable analysis: age, gender and the pooled variables with RR greater than 2.0 in the univariable analysis.