title: Guidelines for Reporting Reliability and Agreement Studies (GRRAS) were proposed.
abstract: OBJECTIVE
  Results of reliability and agreement studies are intended to provide information about the amount of error inherent in any diagnosis, score, or measurement. The level of reliability and agreement among users of scales, instruments, or classifications is widely unknown. Therefore, there is a need for rigorously conducted interrater and intrarater reliability and agreement studies. Information about sample selection, study design, and statistical analysis is often incomplete. Because of inadequate reporting, interpretation and synthesis of study results are often difficult. Widely accepted criteria, standards, or guidelines for reporting reliability and agreement in the health care and medical field are lacking. The objective was to develop guidelines for reporting reliability and agreement studies.
  
  
  METHODS
  Eight experts in reliability and agreement investigation developed guidelines for reporting.
  
  
  RESULTS
  Fifteen issues that should be addressed when reliability and agreement are reported are proposed. The issues correspond to the headings usually used in publications.
  
  
  CONCLUSIONS
  The proposed guidelines intend to improve the quality of reporting.
authors.affiliation: jan.kottner@email.de
authors.forename: Jan
authors.initials: J
authors.lastname: Kottner
authors.forename: Laurent
authors.initials: L
authors.lastname: Audige
authors.forename: Stig
authors.initials: S
authors.lastname: Brorson
authors.forename: Allan
authors.initials: A
authors.lastname: Donner
authors.forename: Byron J
authors.initials: BJ
authors.lastname: Gajewski
authors.forename: Asbjørn
authors.initials: A
authors.lastname: Hróbjartsson
authors.forename: Chris
authors.initials: C
authors.lastname: Roberts
authors.forename: Mohamed
authors.initials: M
authors.lastname: Shoukri
authors.forename: David L
authors.initials: DL
authors.lastname: Streiner