Intended for healthcare professionals

Endgames Statistical Question

Sampling III

BMJ 2010; 340 doi: (Published 14 January 2010) Cite this as: BMJ 2010;340:c93
  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}

    The prevalence, awareness, treatment, and control of hypertension in the general adult population of China were investigated. To ensure a representative sample of the population, the country was listed by locality (rural v urban communities) and then region (north v south). Twenty naturally occurring communities (clusters) were randomly selected, equally distributed between streets in urban areas and townships in rural areas for both the north and south. Within each cluster, equal numbers of men and women were randomly selected for each 10 year age range between 35 and 74 years.1

    Which one of the following best describes the sampling method used in the above study?

    • a) Cluster sampling

    • b) Snowball sampling

    • c) Stratified cluster random sampling

    • d) Quasi-random …

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