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Review

Tips for learners of evidence-based medicine: 1. Relative risk reduction, absolute risk reduction and number needed to treat

Alexandra Barratt, Peter C. Wyer, Rose Hatala, Thomas McGinn, Antonio L. Dans, Sheri Keitz, Virginia Moyer, Gordon Guyatt for and ; The Evidence-Based Medicine Teaching Tips Working Group
CMAJ August 17, 2004 171 (4) 353-358; DOI: https://doi.org/10.1503/cmaj.1021197
Alexandra Barratt
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Peter C. Wyer
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Rose Hatala
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Thomas McGinn
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Antonio L. Dans
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Sheri Keitz
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Virginia Moyer
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Gordon Guyatt for
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    • Tips for teachers of evidence-based medicine: 1. Relative risk reduction, absolute risk reduction and number needed to treat - A companion version of this article directed at teachers of evidence-based medicine [207 KB PDF]

      An interactive version of this article as well as other tools and resources can be found at www.ebmtips.net/ci001.asp

Related Articles

  • (2004). Highlights of this issue. CMAJ, 171(4), 307. Accessed January 25, 2021. Retrieved from http://www.cmaj.ca/content/171/4/307.
  • Wyer, P. C., Keitz, S., Hatala, R., Hayward, R., Barratt, A., Montori, V., Wooltorton, E., & Guyatt, G. (2004). Tips for learning and teaching evidence-based medicine: introduction to the series. CMAJ, 171(4), 347-348. Accessed January 25, 2021. https://doi.org/10.1503/cmaj.1031665.
  • Montori, V. M., Wyer, P., Newman, T. B., Keitz, S., & Guyatt, G. (2005). Tips for learners of evidence-based medicine: 5. The effect of spectrum of disease on the performance of diagnostic tests. CMAJ, 173(4), 385-390. Accessed January 25, 2021. https://doi.org/10.1503/cmaj.1031666.
  • McGinn, T., Wyer, P. C., Newman, T. B., Keitz, S., Leipzig, R., & for, G. G. (2004). Tips for learners of evidence-based medicine: 3. Measures of observer variability (kappa statistic). CMAJ, 171(11), 1369-1373. Accessed January 25, 2021. https://doi.org/10.1503/cmaj.1031981.
  • Barratt, A. L., Wyer, P. C., Guyatt, G., & Simpson, J. M. (2005). NNT for studies with long-term follow-up. CMAJ, 172(5), 613-615. Accessed January 25, 2021. https://doi.org/10.1503/cmaj.1041709.
  • Hatala, R., Keitz, S., Wyer, P., & Guyatt, G. (2005). Tips for learners of evidence-based medicine: 4. Assessing heterogeneity of primary studies in systematic reviews and whether to combine their results. CMAJ, 172(5), 661-665. Accessed January 25, 2021. https://doi.org/10.1503/cmaj.1031920.
  • Montori, V. M., Kleinbart, J., Newman, T. B., Keitz, S., Wyer, P. C., Moyer, V., & Guyatt, G. (2004). Tips for learners of evidence-based medicine: 2. Measures of precision (confidence intervals). CMAJ, 171(6), 611-615. Accessed January 25, 2021. https://doi.org/10.1503/cmaj.1031667.
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In this issue

Canadian Medical Association Journal: 171 (4)
CMAJ
Vol. 171, Issue 4
17 Aug 2004
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Tips for learners of evidence-based medicine: 1. Relative risk reduction, absolute risk reduction and number needed to treat
Alexandra Barratt, Peter C. Wyer, Rose Hatala, Thomas McGinn, Antonio L. Dans, Sheri Keitz, Virginia Moyer, Gordon Guyatt for
CMAJ Aug 2004, 171 (4) 353-358; DOI: 10.1503/cmaj.1021197

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Tips for learners of evidence-based medicine: 1. Relative risk reduction, absolute risk reduction and number needed to treat
Alexandra Barratt, Peter C. Wyer, Rose Hatala, Thomas McGinn, Antonio L. Dans, Sheri Keitz, Virginia Moyer, Gordon Guyatt for
CMAJ Aug 2004, 171 (4) 353-358; DOI: 10.1503/cmaj.1021197
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  • Article
    • Clinician learners' objectives
    • Tip 1: Understanding risk and risk reduction
    • Tip 2: Balancing benefits and adverse effects in individual patients
    • Tip 3: Calculating and using number needed to treat
    • Conclusions
    • Appendix 1
    • Footnotes
    • References
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  • Related Content
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Related Articles

  • Highlights of this issue
  • Tips for learning and teaching evidence-based medicine: introduction to the series
  • Tips for learners of evidence-based medicine: 5. The effect of spectrum of disease on the performance of diagnostic tests
  • Tips for learners of evidence-based medicine: 3. Measures of observer variability (kappa statistic)
  • NNT for studies with long-term follow-up
  • Tips for learners of evidence-based medicine: 4. Assessing heterogeneity of primary studies in systematic reviews and whether to combine their results
  • Tips for learners of evidence-based medicine: 2. Measures of precision (confidence intervals)
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  • Editor's note
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  • Tips for learners of evidence-based medicine: 2. Measures of precision (confidence intervals)
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