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Correction to: Choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial – the development of the DELTA2 guidance

Trials volume 20, Article number: 602 (2019) Cite this article

The original article was published in Trials 2018 19:542

Correction to: Trials (2018) 19:542

https://doi.org/10.1186/s13063-018-2887-x

Following publication of the original article [1], we have been notified of a few mistakes:

  • Figure 1:

    • “1351 titles and abstracts” should read “1322 titles and abstracts”

    • "Stat Biopharm Res" value should be "8" instead of "18"

    • "Stat Med" value should be "226" instead of "74"

    • "Stat Methods Med Res" value should be "74" instead of "226"

    • Results section, Stage 5, first paragraph, the phrase:

      • “It was endorsed by the MRC-NIHR Methodology Advisory Group on March 12, 2018, with minor updating of references and the final version produced on April 18, 2017” should read

      • “It was endorsed by the MRC-NIHR Methodology Advisory Group on March 12, 2018, with minor updating of references and the final version produced on April 18, 2018”.

Reference

  1. 1.

    Sones W, et al. Choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial – the development of the DELTA2 guidance. Trials. 2018;19:542. https://doi.org/10.1186/s13063-018-2887-x.

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Author information

Affiliations

  1. Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Botnar Research Centre, Nuffield Orthopaedic Centre, Windmill Rd, Oxford, OX3 7LD, UK
    • William Sones
    • , Doug Altman
    •  & Jonathan Alistair Cook
  2. Medical Statistics Group, ScHARR, The University of Sheffield, Regent Court, 30 Regent Street, Sheffield, S1 4DA, UK
    • Steven A. Julious
    • , Joanne C. Rothwell
    •  & Stephen J. Walters
  3. Health Services Research Unit, University of Aberdeen, Health Sciences Building, Foresterhill, Aberdeen, AB25 2ZD, UK
    • Craig Robert Ramsay
  4. Department of Mathematics and Statistics, Lancaster University, Lancaster, LA1 4YF, UK
    • Lisa V. Hampson
  5. Statistical Methodology and Consulting, Novartis Pharma AG, Basel, Switzerland
    • Lisa V. Hampson
  6. Department of Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King ’ s College London, De Crespigny Park, Denmark Hill, London, SE5 8AF, UK
    • Richard Emsley
  7. Department of Health Sciences, Seebohm Rowntree Building, University of York, Heslington, York, YO10 5DD, UK
    • Catherine Hewitt
    •  & Martin Bland
  8. Clinical Epidemiology Program, Ottawa Hospital Research Institute, 501 Smyth Road, Box 201B, Ottawa, ON, K1H 8L6, Canada
    • Dean A. Fergusson
  9. Johnson & Johnson, One J&J Plaza, New Brunswick, NJ, 08933, USA
    • Jesse A. Berlin
  10. Health Economics Group, Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK
    • Luke David Vale
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Corresponding author

Correspondence to Jonathan Alistair Cook.

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Sones, W., Julious, S.A., Rothwell, J.C. et al. Correction to: Choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial – the development of the DELTA2 guidance. Trials 20, 602 (2019). https://doi.org/10.1186/s13063-019-3809-2

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