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True costs are different from those given in paper

BMJ 1996; 312 doi: (Published 29 June 1996) Cite this as: BMJ 1996;312:1670
  1. N R Waugh
  1. Director Scottish Health Purchasing Information Centre, Summerfield House, Aberdeen AB9 1RE

    EDITOR,—I believe that there are problems with the costing used in J P O'Hare and colleagues' study of the effect of adding retinal photography to screening for diabetic retinopathy.1

    Firstly, no detail of the method is given. The figure of £12.50 for the cost of adding photography first appears in the discussion, and it would be useful to know what it includes (for example, labour, materials, capital for camera and van).

    Secondly, the cost per patient whose sight is saved is based on dividing the extra cost of adding …

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