Quality ofmeta-analyses for randomized trials in the field of hypertension: A systematic review

George C. Roush, Brigani Amante, Tanveer Singh, Hiwot Ayele, Morakinyo Araoye, Danwen Yang, William J. Kostis, William J. Elliott, John B. Kostis, Jesse A. Berlin

Research output: Contribution to journalReview articlepeer-review

2 Scopus citations

Abstract

Objectives: Doubling on average every 6 years, hypertension-related meta-analyses are now published twice weekly and are often considered the highest level of evidence for clinical practice. However, some hypertension specialists and guideline authors view meta-analyses with skepticism. This article evaluates the quality of hypertension-related meta-analyses of clinical trials. Methods: A systematic search was conducted for metaanalyses of clinical trials recently published over 3.3 years. Specific criteria reproducibly assessed 26 features in the four domains of meta-analysis quality, domains justified by fundamental analytics and extensive research: analyzing trial quality, analyzing heterogeneity, analyzing publication bias, and providing transparency. Results: A total of 143 meta-analyses were identified. A total of 44% had 8R deficient features with no relation to journal impact factor: odds ratio relating 8R deficient features to the upper third versus lower third of impact factor=1.3 (95% confidence limit 0.6-2.9). A total of 56% had all four domains deficient. Quality did not improve over time. Thirty articles (21%) reported statistically significant results (P<0.05) from inappropriate DerSimonian-Laird models, whereas unreported, appropriate, Knapp-Hartung models gave statistical nonsignificance; 88% of these 30 articles reported the incorrect results in their abstracts. A total of 60% of all meta-analyses failed to conduct analyses in subgroups of quality when indicated, 63% failed to report Tau and Tau2, 57% omitted testing for publication bias, none conducted a cumulative analysis for publication bias, and 71-77% omitted mentioning in their abstracts problems of trial quality, heterogeneity, and publication bias. Conclusion: Although widespread, deficiencies in hypertension-related meta-analyses are readily corrected and do not represent flaws inherent in the meta-analytic method.

Original languageEnglish (US)
Pages (from-to)2305-2317
Number of pages13
JournalJournal of Hypertension
Volume34
Issue number12
DOIs
StatePublished - 2016

All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Physiology
  • Cardiology and Cardiovascular Medicine

Keywords

  • Blood pressure
  • Hypertension
  • Meta-analysis as topic
  • Randomized controlled trials [publication type]
  • Review [publication type]
  • Systematic review

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