title: Postinfectious irritable bowel syndrome--a meta-analysis.
abstract: OBJECTIVE
  Irritable bowel syndrome (IBS) is a heterogeneous disorder affecting 12% of the population worldwide. Several studies identify IBS as a sequela of infectious gastroenteritis (IGE) with reported prevalence ranging from 4% to 31% and relative risk from 2.5 to 11.9. This meta-analysis was conducted to explore the differences between reported rates and provide a pooled estimate of risk for postinfectious irritable bowel syndrome (PI-IBS).
  
  
  METHODS
  Electronic databases (MEDLINE, OLDMEDLINE, EMBASE, Cochrane database of clinical trials) and pertinent reference lists (including other review articles).
  
  
  METHODS
  Data were abstracted from included studies by two independent investigators; study quality, heterogeneity, and publication bias were assessed; sensitivity analysis was performed; and a summative effect estimate was calculated for risk of PI-IBS.
  
  
  RESULTS
  Eight studies were included for analysis and all reported elevated risk of IBS following IGE. Median prevalence of IBS in the IGE groups was 9.8% (IQR 4.0-13.3) and 1.2% in control groups (IQR 0.4-1.8) (sign-rank test, p= 0.01). The pooled odds ratio was 7.3 (95% CI, 4.7-11.1) without significant heterogeneity (chi2 heterogeneity statistic, p= 0.41). Subgroup analysis revealed an association between PI-IBS risk and IGE definition used.
  
  
  CONCLUSIONS
  This study provides supporting evidence for PI-IBS as a sequela of IGE and a pooled risk estimate revealing a sevenfold increase in the odds of developing IBS following IGE. The results suggest that the long-term benefit of reduced PI-IBS may be gained from primary prevention of IGE.
authors.affiliation: Department of Preventive Medicine and Biometrics, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20817-4799, USA.
authors.forename: Heather A
authors.initials: HA
authors.lastname: Halvorson
authors.forename: Carey D
authors.initials: CD
authors.lastname: Schlett
authors.forename: Mark S
authors.initials: MS
authors.lastname: Riddle
mesh_terms: D000328:Adult; D005260:Female; D005759:Gastroenteritis / Q000150:complications*; D006801:Humans; D043183:Irritable Bowel Syndrome / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors