title: Impact of the transparent reporting of evaluations with nonrandomized designs reporting guideline: ten years on.
abstract: OBJECTIVE
  We assessed how the Transparent Reporting of Evaluations with Nonrandomized Designs (TREND) reporting guideline was used by authors and journal editors in journals' instructions to authors. We also evaluated its impact on reporting completeness and study quality.
  
  
  METHODS
  We extracted data from publications that cited TREND on how TREND was used in those reports; we also extracted information on journals' instructions to authors. We then undertook a case-control study of relevant publications to evaluate the impact of using TREND.
  
  
  RESULTS
  Between 2004 and 2013, TREND was cited 412 times, but it was only evidently applied to study reports 47 times. TREND was specifically mentioned 14 times in the sample of 61 instructions to authors. Some evidence suggested that use of TREND was associated with more comprehensive reporting and higher study quality ratings.
  
  
  CONCLUSIONS
  TREND appeared to be underutilized by authors and journal editors despite its potential application and benefits. We found evidence that suggested that using TREND could contribute to more transparent and complete study reports. Even when authors reported using TREND, reporting completeness was still suboptimal.
authors.affiliation: Thomas Fuller is with the Collaboration for Leadership in Applied Health Research and Care (CLAHRC) for the South West Peninsula, University of Exeter Medical School, Exeter, UK. Jaime Peters, Mark Pearson, and Rob Anderson are with Evidence Synthesis and Modelling for Health Improvement (ESMI), University of Exeter Medical School.
authors.forename: Thomas
authors.initials: T
authors.lastname: Fuller
authors.forename: Jaime
authors.initials: J
authors.lastname: Peters
authors.forename: Mark
authors.initials: M
authors.lastname: Pearson
authors.forename: Rob
authors.initials: R
authors.lastname: Anderson
mesh_terms: D002986:Clinical Trials as Topic / Q000592:standards* / Q000706:statistics & numerical data; D035081:Editorial Policies; D019983:Guideline Adherence; D017408:Guidelines as Topic; D006801:Humans; D010506:Periodicals as Topic / Q000592:standards* / Q000706:statistics & numerical data