title: Unit of observation versus unit of analysis.
authors.affiliation: Institute of 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: D002253:Carbonated Beverages / Q000706:statistics & numerical data*; D002648:Child; D003627:Data Interpretation, Statistical; D006801:Humans; D016032:Randomized Controlled Trials as Topic