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Incorrect study design and analysis: risk factors for progression of subclinical diabetic macular oedema
  1. Gerald McGwin Jr1,2
  1. 1Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
  2. 2Department of Ophthalmology, University of Alabama at Birmingham, Birmingham, Alabama, USA
  1. Correspondence to Gerald McGwin, Departments of Epidemiology and Ophthalmology, University of Alabama at Birmingham, 609 Eye Foundation Hospital, 1720 University Boulevard, Birmingham, AL 35294, USA; mcgwin{at}uab.edu

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The recently published study by Bhavsar and Subramanian1 is described as a case-controlled study; however, this is incorrect. The study participants were selected on the basis of an exposure of interest, that is, central subfield macular thickness and matched with respect to age, sex and duration of diabetes. (It is important to note that the ‘study participants’ are not …

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