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Interpretation of Changes in Health-related Quality of Life The Remarkable Universality of Half a Standard Deviation

Interpretation of Changes in Health-related Quality of Life The Remarkable Universality of Half a... MEDICAL CARE Volume 41, Number 5, pp 582–592 ©2003 Lippincott Williams & Wilkins, Inc. Point/Counterpoint Interpretation of Changes in Health-related Quality of Life The Remarkable Universality of Half a Standard Deviation † ‡ GEOFFREY R. NORMAN,PHD,* JEFF A. SLOAN,PHD, AND KATHLEEN W. WYRWICH,PHD BACKGROUND. A number of studies have com- options. Negative changes were not associated puted the minimally important difference (MID) with larger ESs. Population-based estimation for health-related quality of life instruments. procedures and brief follow-up were associated OBJECTIVE. To determine whether there is with smaller ESs, and acute conditions with consistency in the magnitude of MID esti- larger ESs. An explanation for this consistency is mates from different instruments. that research in psychology has shown that the METHODS. We conducted a systematic review limit of people’s ability to discriminate over a of the literature to identify studies that com- wide range of tasks is approximately 1 part in 7, puted an MID and contained sufficient informa- which is very close to half a SD. tion to compute an effect size (ES). Thirty-eight CONCLUSION. In most circumstances, the studies fulfilled the criteria, resulting in 62 ESs. threshold of discrimination for changes in RESULTS. For all but 6 studies, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Medical Care Wolters Kluwer Health

Interpretation of Changes in Health-related Quality of Life The Remarkable Universality of Half a Standard Deviation

Medical Care , Volume 41 (5) – May 1, 2003

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ISSN
0025-7079
eISSN
1537-1948
DOI
10.1097/01.MLR.0000062554.74615.4C
pmid
12719681
Publisher site
See Article on Publisher Site

Abstract

MEDICAL CARE Volume 41, Number 5, pp 582–592 ©2003 Lippincott Williams & Wilkins, Inc. Point/Counterpoint Interpretation of Changes in Health-related Quality of Life The Remarkable Universality of Half a Standard Deviation † ‡ GEOFFREY R. NORMAN,PHD,* JEFF A. SLOAN,PHD, AND KATHLEEN W. WYRWICH,PHD BACKGROUND. A number of studies have com- options. Negative changes were not associated puted the minimally important difference (MID) with larger ESs. Population-based estimation for health-related quality of life instruments. procedures and brief follow-up were associated OBJECTIVE. To determine whether there is with smaller ESs, and acute conditions with consistency in the magnitude of MID esti- larger ESs. An explanation for this consistency is mates from different instruments. that research in psychology has shown that the METHODS. We conducted a systematic review limit of people’s ability to discriminate over a of the literature to identify studies that com- wide range of tasks is approximately 1 part in 7, puted an MID and contained sufficient informa- which is very close to half a SD. tion to compute an effect size (ES). Thirty-eight CONCLUSION. In most circumstances, the studies fulfilled the criteria, resulting in 62 ESs. threshold of discrimination for changes in RESULTS. For all but 6 studies,

Journal

Medical CareWolters Kluwer Health

Published: May 1, 2003

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