Letter

Study's design leaves cost effectiveness and “therapeutic impact” in doubt

BMJ 1995; 311 doi: 10.1136/bmj.311.7000.327b (Published 29 July 1995)
Cite this as: BMJ 1995;311:327.3

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  1. Philip J G Kirby,
  2. Jeffrie R Strang
  1. Senior registrar in public health medicine Consultant in public health medicine North Yorkshire Health Authority, York YO3 4XF

    EDITOR,--Evaluation of diagnostic technology is generally more difficult than evaluation of therapeutic technology and is often omitted. C M Francis and colleague's study of the use made by general practitioners of an open access echocardiography service is therefore welcome.1 The descriptive design of the study, however, limits the conclusions that may be drawn from the findings. A comparative study (for example, with a randomised design) would …

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