Higgins, Julian P. T.1; Thompson, Simon G.1; Deeks, Jonathan J.2; Altman, Douglas G.2
Measuring inconsistency in meta-analyses
BMJ. September 6, 2003;327(7414):557-560
Affiliations
1MRC Biostatistics Unit, Institute of Public Health, Cambridge CB2 2SR
2Cancer Research UK/NHS Centre for Statistics in Medicine, Institute of Health Sciences, Oxford OX3 7LF
Abstract
Cochrane Reviews have recently started including the quantity I² to help readers assess the consistency of the results of studies in meta-analyses. What does this new quantity mean, and why is assessment of heterogeneity so important to clinical practice?