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Journal of Pediatric Psychology Advance Access originally published online on December 18, 2008
Journal of Pediatric Psychology 2009 34(9):903-916; doi:10.1093/jpepsy/jsn118
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© The Author 2008. Published by Oxford University Press on behalf of the Society of Pediatric Psychology. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Putting Research in Context: Understanding Confidence Intervals from One or More Studies

Sue Finch1 and Geoff Cumming2

1The University of Melbourne and 2La Trobe University

All correspondence concerning this article should be addressed to Sue Finch, Statistical Consulting Centre, The University of Melbourne, Melbourne, Victoria, Australia. E-mail: s.finch{at}ms.unimelb.edu.au


  Abstract

Objectives To support wider use and higher quality interpretation of confidence intervals (CIs) in psychology. Methods We discuss the meaning and interpretation of CIs in single studies, and illustrate the value of CIs when reviewing and integrating research findings across studies. We demonstrate how to find CIs from summary statistics and published data in some simple situations. Results We provide the ESCI graphical software, which runs under Microsoft Excel, to assist with calculating and plotting CIs. (www.latrobe.edu.au/psy/esci) Conclusions The wider use of CIs in psychology should support quality research communication and integrated interpretation of findings in context.

Key words: confidence intervals; research design and methods; statistical applications.

Received March 31, 2008; revision received October 13, 2008; accepted October 16, 2008


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