Access Keys:
Skip to content (Access Key - 0)

How to assess power and sample size

Cadeddu M, Farrokhyar F, Thoma A, Haines T, Garnett A, Goldsmith CH, Evidence-Based Surgery Working Group. Users' guide to the surgical literature: how to assess power and sample size. Laparoscopic vs open appendectomy. Can J Surg 2008;51(6):476-82.

Abstract

A common difficulty encountered by surgeons is the broad range of treatment choices available for a surgical condition. Observational studies and small randomized trials account for a large proportion of the surgical literature. There are many reasons for this, but the clinician is left with evidence from small studies on which to base his or her practice. How can a surgeon know from a study that reports no difference between treatments whether the study group was too small to detect any difference?

This question refers to whether a study is adequately powered to answer the research question. We provide a succinct overview of power issues in surgical studies to better equip clinicians to assess the adequacy of a study’s sample size and to determine whether its conclusions are valid and can be used to guide surgical practice.

View in PubMed

Download PDF

Peer Review

OrthopaedicsOne Peer Review Workflow is an innovative platform that allows the process of peer review to occur right within an OrthopaedicsOne article in an open, transparent and flexible manner. Learn more

Instructions for Authors

Read our Instructions for Authors to learn about contributing or editing articles on OrthopaedicsOne.

Content Partner

Learn about becoming an OrthopaedicsOne Content Partner.

Academic Resources

Resources on How to assess power and sample size from Pubget.

The license could not be verified: License Certificate has expired!
Orthopaedic Web Links

Internet resources validated by OrthopaedicWebLinks.com

The license could not be verified: License Certificate has expired!
Related Content

Resources on How to assess power and sample size and related topics in OrthopaedicsOne spaces.

Page: How to use an article about a diagnostic test (OrthopaedicsOne Articles)
Page: How to use an article evaluating surgical interventions (OrthopaedicsOne Articles)
Page: How to use an article on economic analysis (OrthopaedicsOne Articles)
Page: How to use an article reporting population-based volume-outcome relationships in surgery (OrthopaedicsOne Articles)
Page: How to perform a literature search (OrthopaedicsOne Articles)
Page: How to use a systematic literature review and meta-analysis (OrthopaedicsOne Articles)
Page: How to assess a randomized controlled trial in surgery (OrthopaedicsOne Articles)
Page: Self-audit and practice appraisal for surgeons (OrthopaedicsOne Articles)
Page: How to use a decision analysis (OrthopaedicsOne Articles)
Page: How to assess an article on health-related quality of life (OrthopaedicsOne Articles)
Showing first 10 of 25 results