Journal article
Effect sizes can be calculated for studies reporting ranges for outcome variables in systematic reviews
Abstract
OBJECTIVE: To develop a method by which studies reporting the ranges (or maxima and minima) of observed outcomes can be included in systematic reviews, along with other studies reporting in the more usual way by using standard deviations (SDs).
STUDY DESIGN AND SETTING: An approach is proposed to allow a numerical conversion of a reported range from a continuous outcome into an equivalent SD.
Authors
Walter SD; Yao X
Journal
Journal of Clinical Epidemiology, Vol. 60, No. 8, pp. 849–852
Publisher
Elsevier
Publication Date
August 2007
DOI
10.1016/j.jclinepi.2006.11.003
ISSN
0895-4356