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Table 2 Perceived food intolerance in Giardia exposed (n = 764) and a control group (n = 1100) 3 years after an outbreak of giardiasis in Bergen, Norway, 2004

From: Perceived food intolerance and irritable bowel syndrome in a population 3 years after a giardiasis-outbreak: a historical cohort study

   Perceived food intolerancea
Group   No   Yesb       Severity of perceived food intolerance  
    Unadjusted Adjustedc Light Moderate Severe P
N n % n % OR 95 % CI OR 95 % CI n % n % n %  
Exposure status                 
 Exposed 764 276 36.1 488 63.9 1.94 1.61 to 2.35 2.00 1.65 to 2.42 238 31.2 168 22.0 82 10.7 <0.001
 Control 1100 576 52.4 524 47.6 368 33.5 116 10.5 40 3.6
IBS status                 
 IBS 501 98 19.6 403 80.4 5.16 4.04 to 6.60 5.03 3.93 to 6.45 147 29.3 167 33.3 89 17.8 <0.001
 No-IBS 1344 748 55.7 596 44.3 451 33.6 113 8.4 32 2.4
   Within IBS                 
   Exposed 348 65 18.7 283 81.3 1.20d 0.75 to 1.92 1.25 0.78 to 2.01 105 30.2 111 31.9 67 19.3 0.418
   Control 153 33 21.6 120 78.4 42 27.5 56 36.6 22 14.4
   Within No-IBS                 
   Exposed 406 207 51.0 199 49.0 1.31d 1.04 to 1.66 1.36 1.07 to 1.72 130 32.0 55 13.5 14 3.4 <0.001
   Control 938 541 57.7 397 42.3 321 34.2 58 6.2 18 1.9
  1. Abbreviations: IBS irritable bowel syndrome, P p-value from Pearson’s chi square test (exact), CI confidence interval, OR odds ratio
  2. aThe question pertaining to these categories was: “Do certain types of food give you abdominal symptoms?” with four alternatives: none, light, moderate, severe
  3. bFour level response variable dichotomized to no (none) vs. yes (light, moderate or severe)
  4. cAdjusted for gender and age
  5. dThe Breslis reasonably high, howeverow-Day test was non-significant