Endgames Statistical Question

Sampling I

BMJ 2009; 339 doi: http://dx.doi.org/10.1136/bmj.b5512 (Published 31 December 2009) Cite this as: BMJ 2009;339:b5512
  1. Philip Sedgwick, senior lecturer in medical statistics
  1. 1Centre for Medical and Healthcare Education, St George’s, University of London, Tooting, London SW17 0RE
  1. p.sedgwick{at}sgul.ac.uk

    A randomised double blind placebo controlled clinical trial investigated the long term effects of glucosamine sulphate on the progression of osteoarthritis of the knee. In total, 212 patients aged over 50 years with diagnosed osteoarthritis of the knee were recruited as they presented to an outpatient clinic.1

    Which one of the following statements best describes the sampling method by which participants were recruited to the above trial? …

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