title: Randomised controlled trials: understanding confounding.
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: D000058:Accidental Falls / Q000517:prevention & control; D000368:Aged; D000369:Aged, 80 and over; D015986:Confounding Factors, Epidemiologic; D005081:Exercise Therapy / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data*