title: Less is less: a systematic review of graph use in meta-analyses.
abstract: Graphs are an essential part of scientific communication. Complex datasets, of which meta-analyses are textbook examples, benefit the most from visualization. Although a number of graph options for meta-analyses exist, the extent to which these are used was hitherto unclear. A systematic review on graph use in meta-analyses in three disciplines (medicine, psychology, and business) and nine journals was conducted. Interdisciplinary differences, which are mirrored in the respective journals, were revealed, that is, graph use correlates with external factors rather than methodological considerations. There was only limited variation in graph types (with forest plots as the most important representatives), and diagnostic plots were very rare. Although an increase in graph use over time could be observed, it is unlikely that this phenomenon is specific to meta-analyses. There is a gaping discrepancy between available graphic methods and their application in meta-analyses. This may be rooted in a number of factors, namely, (i) insufficient dissemination of new developments, (ii) unsatisfactory implementation in software packages, and (iii) minor attention on graphics in meta-analysis reporting guidelines. Using visualization methods to their full capacity is a further step in using meta-analysis to its full potential.
authors.affiliation: Department of Basic Psychological Research and Research Methods, School of Psychology, University of Vienna, Liebiggasse 5, A-1010 Vienna, Vienna, Austria. anne.schild@univie.ac.at
authors.forename: Anne H E
authors.initials: AH
authors.lastname: Schild
authors.affiliation: Department of Basic Psychological Research and Research Methods, School of Psychology, University of Vienna, Liebiggasse 5, A-1010 Vienna, Vienna, Austria.
authors.forename: Martin
authors.initials: M
authors.lastname: Voracek
mesh_terms: D000465:Algorithms; D003196:Computer Graphics; D003627:Data Interpretation, Statistical; D057225:Data Mining / Q000379:methods*; D015201:Meta-Analysis as Topic; D009323:Natural Language Processing; D014584:User-Computer Interface; D018875:Vocabulary, Controlled
keywords: forest plot; graph; meta-analysis; research synthesis; systematic review