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Analysis of the time and workers needed to conduct systematic reviews of medical interventions using data from the PROSPERO registry
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  • Published on:
    Figure clarification and data correction from the authors
    • Kathryn A. Kaiser, Assistant Professor University of Alabama at Birmingham
    • Other Contributors:
      • Andrew W. Brown, Assistant Professor

    Readers of our article have indicated that the description of Figure 1 was insufficient to help them understand what it represents. Below, we further describe the figure, correct two minor errors, and provide a summary table.

    Figure 1 description:
    Figure 1 was designed to show two overarching pieces of information. First, the line plots allow the reader to see how the filtering process progresses for individual studies. Each line represents a single study going from one phase to the next. Each phase is centered on the midpoint of the range, giving it a Buchner funnel-like shape. The purpose of this representation, as opposed to having the x-axis anchored to 0 for instance, is that it better highlights the rank changes across phases. Just because a study has a large number of papers at one phase does not mean that it will have the largest number included at a subsequent phase, and this difference can sometimes be pronounced (as evidenced by steeply crossing lines).The second piece of information was summary statistics represented in boxplots overlaid at each phase, which are more self-explanatory.

    Figure 1 data processing:
    For the lineplots, four studies were excluded because their values were greater than 2.5 standard deviations above the mean for the ‘Total N Found’ variable. Had these four studies been plotted, all other lines would have been compressed to the left of the figure because of how far these four values would have extended the axis...

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    Conflict of Interest:
    None declared.