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COMMENTARY |

Mine Is Bigger Than YoursEffect Sizes: Measures of Effect Size in Research

David L. Streiner, PhD, CPsych; Geoffrey R. Norman, PhD
Author and Funding Information

From the Department of Psychiatry and Behavioural Neorosciences (Dr Streiner) and Department of Clinical Epidemiology and Biostatistics (Dr Norman), McMaster University, Hamilton, ON; and Department of Psychiatry (Dr Streiner), University of Toronto, Toronto, ON, Canada.

Correspondence to: David L. Streiner, PhD, CPsych, St. Joseph’s Health Care, W5th Campus, 100 W 5th St, Box 585, Hamilton, ON, L8N 3K7, Canada; e-mail: streiner@mcmaster.ca


Financial/nonfinancial disclosures: The authors have reported to CHEST that no potential conflicts of interest exist with any companies/organizations whose products or services may be discussed in this article.

Reproduction of this article is prohibited without written permission from the American College of Chest Physicians (http://www.chestpubs.org/site/misc/reprints.xhtml).


Chest. 2012;141(3):595-598. doi:10.1378/chest.11-2473
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Results of studies that use laboratory tests are often easy to interpret, because we are familiar with the units and how to interpret them. However, this is not the case when the results are presented as ORs, relative risks, correlation, or scores on an unfamiliar scale. This article explains these various indices of effect sizes—how they are calculated, what they mean, and how they are interpreted.


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