title: Meta-analysis as a guide to clinical practice.
abstract: BACKGROUND
  Meta-analysis is now widely used in order to increase the power of individual clinical studies. Important far-reaching conclusions have been derived by pooling the results of studies which in isolation would not be large enough to reach definitive conclusions. While the statistical power is thereby amplified, so is the potential for error.
  
  
  OBJECTIVE
  To assess the potential and the pitfalls of meta-analysis as a guide to clinical practice.
  
  
  CONCLUSIONS
  Conclusions derived from meta-analysis may be influenced by unrecognized selection bias and heterogeneity of studies included. Publication of the results may be in a form which does not lend itself readily to critical analysis and misleading results may therefore be accepted.
authors.affiliation: Department of Medicine, University of Leicester, UK.
authors.forename: J D
authors.initials: JD
authors.lastname: Swales
mesh_terms: D000959:Antihypertensive Agents / Q000627:therapeutic use; D015982:Bias; D002561:Cerebrovascular Disorders / Q000517:prevention & control; D003327:Coronary Disease / Q000517:prevention & control; D006801:Humans; D006973:Hypertension / Q000178:diet therapy / Q000188:drug therapy; D015201:Meta-Analysis as Topic; D009203:Myocardial Infarction / Q000517:prevention & control; D012982:Sodium, Dietary / Q000008:administration & dosage
chemical_list: D000959:Antihypertensive Agents; D012982:Sodium, Dietary