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Interpretation of study's results is open to criticism

BMJ 1996; 312 doi: (Published 27 January 1996) Cite this as: BMJ 1996;312:254
  1. Ralf Bender,
  2. Peter T Sawicki
  1. Statistician Senior lecturer Department of Metabolic Diseases and Nutrition, Heinrich-Heine University Dusseldorf, PO Box 10 10 07, D-40001 Dusseldorf, Germany

    EDITOR,—The Microalbuminuria Collaborative Study Group concludes that intensive insulin treatment had no impact on the progression of nephropathy in insulin dependent diabetic patients with microalbuminuria.1 The analysis, presentation, and interpretation of their data, however, are open to criticism.

    The main conclusion is based on a non-significant difference in the slopes of albumin excretion between the two groups. However, only the P value and a confidence interval for the overall mean slope are given, without descriptive information. The authors do not give the mean slopes for each group, standard …

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