title: Understanding the ecological fallacy.
authors.affiliation: Institute for Medical and Biomedical Education, St George's, University of London, London, UK p.sedgwick@sgul.ac.uk.
authors.forename: Philip
authors.initials: P
authors.lastname: Sedgwick
mesh_terms: D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D015982:Bias; D003430:Cross-Sectional Studies; D058006:General Practice; D006801:Humans; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data*; D012606:Scotland; D014295:Trimethoprim / Q000008:administration & dosage*; D014296:Trimethoprim Resistance / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents; D014295:Trimethoprim