Systematic reviews with meta-analysis of clinical trials: Is there enough evidence?

Josep M. Garcia-Alamino, Manuel Lopez-Cano

    Research output: Contribution to journalArticleResearch


    © 2019 AEC Systematic reviews with meta-analysis are essential tools to reliably summarize the effectiveness of health interventions. A meta-analysis based exclusively on a small number of trials will often not be conclusive or may yield false positive results. The estimation of the optimal information size (OIS) can reduce the risk of obtaining false positive results and determine if additional clinical trials are required. The estimation of the OIS is very similar to that used to estimate the sample size of a clinical trial. The required number of participants for the meta-analysis should be at least as large as a single trial with adequate power. The OIS concept provides a statistical framework in which the accumulated information is convincing to indicate whether more clinical trials are needed to address the effects of the intervention.
    Original languageEnglish
    JournalCirugia Espanola
    Publication statusPublished - 1 Jan 2019


    • Meta-analysis
    • Optimal information size
    • Systematic review
    • Trial sequential analysis


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