title: Volume and methodological quality of randomized controlled trials in laparoscopic surgery: assessment over a 10-year period.
abstract: BACKGROUND
  Measures have been taken to improve methodological quality of randomized controlled trials (RCTs). This review systematically assessed the trends in volume and methodological quality of RCTs on minimally invasive surgery within a 10-year period.
  
  
  METHODS
  RCTs on minimally invasive surgery were searched in the 10 most cited general surgical journals and the 5 most cited journals of laparoscopic interest for the years 2002 and 2012. Bibliometric and methodological quality components were abstracted using the Scottish Intercollegiate Guidelines Network. The pooled number of RCTs from low-contribution regions demonstrated an increasing proportion of the total published RCTs, compensating for a concomitant decrease of the respective contributions from Europe and North America. International collaborations were more frequent in 2012. Acceptable or high quality RCTs accounted for 37.9% and 54.4% of RCTs published in 2002 and 2012, respectively. Components of external validity were poorly reported.
  
  
  CONCLUSIONS
  Both the volume and the reporting quality of laparoscopic RCTs have increased from 2002 to 2012, but there seems to be ample room for improvement of methodological quality.
authors.affiliation: Center for Minimally Invasive Surgery, Hospital Neuwerk, Mönchengladbach, Germany; Department of General Surgery, University Hospital of Heraklion, Crete, Greece. Electronic address: stavros.antoniou@hotmail.com.
authors.forename: Stavros A
authors.initials: SA
authors.lastname: Antoniou
authors.affiliation: Department of General Surgery, University Hospital of Heraklion, Crete, Greece.
authors.forename: Alexandros
authors.initials: A
authors.lastname: Andreou
authors.affiliation: Liverpool Vascular and Endovascular Service, Royal Liverpool University Hospital, Liverpool, UK.
authors.forename: George A
authors.initials: GA
authors.lastname: Antoniou
authors.affiliation: Department of General Surgery, Sisters of Charity Hospital, Linz, Austria.
authors.forename: Oliver O
authors.initials: OO
authors.lastname: Koch
authors.affiliation: Department of General Surgery, Sisters of Charity Hospital, Linz, Austria.
authors.forename: Gernot
authors.initials: G
authors.lastname: Köhler
authors.affiliation: Department of General Surgery, Sisters of Charity Hospital, Linz, Austria.
authors.forename: Ruzica-R
authors.initials: RR
authors.lastname: Luketina
authors.affiliation: Department of Social Medicine, Biostatistics Laboratory, Faculty of Medicine, University of Crete, Heraklion, Greece.
authors.forename: Antonios
authors.initials: A
authors.lastname: Bertsias
authors.affiliation: Department of General Surgery, Hospital Zell am See, Zell am See, Austria.
authors.forename: Rudolph
authors.initials: R
authors.lastname: Pointner
authors.affiliation: Center for Minimally Invasive Surgery, Hospital Neuwerk, Mönchengladbach, Germany.
authors.forename: Frank-Alexander
authors.initials: FA
authors.lastname: Granderath
mesh_terms: D015706:Bibliometrics; D006801:Humans; D038622:Internationality; D010535:Laparoscopy; D010506:Periodicals as Topic / Q000706:statistics & numerical data; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data*; D012107:Research Design
keywords: CONSORT; Laparoscopy; Methodological quality; Minimally invasive surgery; Randomized trial; Reporting quality