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  • Incorrect study design and analysis: effect of isometric exercise on choroidal blood flow in patients with age-related macular degeneration

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Incorrect study design and analysis: effect of isometric exercise on choroidal blood flow in patients with age-related macular degeneration
  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 Jr, 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

https://doi.org/10.1136/bjo.2011.204313

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    The recently published study by Metelitsina et al1 is described as a cross-sectional study; however, this is incorrect. In cross-sectional studies, study participants are selected without regard to either exposure (ie, risk factor) or disease (ie, outcome) status. In the current …

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    Footnotes

    • Linked article 205146.

    • Competing interests None.

    • Provenance and peer review Not commissioned; not externally peer reviewed.

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      Authors' response
      Juan E Grunwald
      British Journal of Ophthalmology 2011; 95 1029-1030 Published Online First: 28 Mar 2011. doi: 10.1136/bjo.2011.205146