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Table 1 Results of case-control study of causes of E. coli O103 outbreak in Norway, January-March 2006. The matched analysis includes 15 cases and 45 controls.

From: Outbreak of haemolytic uraemic syndrome in Norway caused by stx 2-positive Escherichia coliO103:H25 traced to cured mutton sausages

Food consumed No. of cases (%) No. of controls (%) mOR 95% confidence interval p-value Adjusted mOR 95% confidence interval p-value
Cured sausage ("morrpølse") 9/14 (64) 6/45 (13) 19.4 (2.4 – 156) 0.005 17.6 (1.6 – 187) 0.018
Beefburger at fastfood chain B* 7/15 (47) 5/45 (11) 14.7 (1.7 – 123) 0.014 12.5 (0.9 – 181) 0.065
Minced beef from producer A 10/14 (71) 20/44 (45) 2.7 (0.8 – 9.5) 0.124    
Lean pork patties 8/14 (57) 9/44 (20) 5.1 (1.3 – 20.4) 0.023    
  1. * Received raw beef patties from producer A