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Endgames Statistical Question

Study design

BMJ 2010; 340 doi: (Published 26 May 2010) Cite this as: BMJ 2010;340:c2667
  1. Philip Sedgwick, senior lecturer in medical statistics
  1. 1Centre for Medical and Healthcare Education, St George’s, University of London, London
  1. p.sedgwick{at}

    Researchers investigated the direct impact of hip fracture on mortality in a cohort of individuals aged over 65 years living in a geographically defined area in western Sydney, Australia.1 At baseline, no one in the cohort had ever experienced a hip fracture. The cohort was followed prospectively over an 18 month study period, during which 211 cases of hip fracture occurred. A total of 201 controls who had not experienced a hip fracture were selected at random from the same cohort. When identified, both cases with hip fracture and controls were subsequently followed for a further year. One year mortality among individuals with hip fracture was 21.7%, compared with 4.7% for controls.

    Which one of the following terms best describes the above study design?

    • a) Case-control study

    • b) …

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