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Table 2 Prevalence and attributable fraction in the Giardia exposed for four functional disorders six years after initial outbreak of Giardia in Bergen, Norway 2004

From: The relationship between irritable bowel syndrome, functional dyspepsia, chronic fatigue and overactive bladder syndrome: a controlled study 6 years after acute gastrointestinal infection

Disorder All Giardia exposed Controls    
(N = 724) (N = 847)    
  N n % n % p-valueb) AFE 95 % CI
No functional disordera) 819 269 38.2 550 68.3 <0.001 n.a. n.a.
Overactive bladder syndrome 247 134 18.7 113 13.6 0.007 27.5 (8.8, 42.4)
Irritable bowel syndrome 387 287 40.1 100 11.9 <0.001 70.3 (63.6, 75.8)
Chronic fatigue 320 224 31.6 96 11.4 <0.001 64.0 (57.1, 71.0)
Functional dyspepsia 200 147 21.0 53 6.6 <0.001 68.6 (57.7, 76.7)
  1. Abbreviations: n.a. not applicable; AFE attributable fraction in the exposed, i.e. the proportion of diseased (in percent) that could have been prevented in the Giardia exposed had the individuals not been exposed to Giardia; CI confidence interval
  2. a) Respondents classified with neither IBS, CF, FD nor OAB; b) p-value for the difference between the Giardia exposed and the control group was calculated with Pearson’s exact χ2 test