title: Vacuum extraction: development and test of a procedure-specific rating scale.
abstract: OBJECTIVE
  To develop and validate an Objective Structured Assessment of Technical Skills (OSATS) scale for vacuum extraction.
  
  
  METHODS
  Two-part study design: Primarily, development of a procedure-specific checklist for vacuum extraction. Hereafter, validation of the developed OSATS scale for vacuum extraction in a prospective observational study.
  
  
  METHODS
  Rigshospitalet, University Hospital of Copenhagen.
  
  
  METHODS
  For development, an obstetric expert from each labor ward in Denmark (28 departments) was invited to participate. For validation, nine first-year residents and 10 chief physicians with daily work in the obstetric field were tested.
  
  
  METHODS
  The Delphi method was used for development of the scale. In a simulated vacuum extraction scenario, first-year residents and obstetric chief physicians were rated using the developed OSATS scale for vacuum extraction to test construct validity of the scale.
  
  
  METHODS
  Consensus for the content of the scale. To test the scale of Cronbach's alpha, interclass correlation and differential item function was calculated in the prospective study.
  
  
  RESULTS
  89% completed the first and 61% completed the second Delphi round. Hereafter, consensus was obtained. There was a significant difference between residents' and experts' performance for total score and for the score of the separate parts of the scale. Cronbach's alpha for total score and for the separate parts of the scale was 0.91-0.95 and interclass correlation 0.84-0.9.
  
  
  CONCLUSIONS
  The OSATS scale for vacuum extraction is a reliable test for differentiating between competence levels in a simulated setting.
authors.affiliation: Juliane Marie Centre for Children, Women and Reproduction, Rigshospitalet, University Hospital of Copenhagen, Copenhagen, Denmark. mmn@rh.regionh.dk
authors.forename: Mathilde
authors.initials: M
authors.lastname: Maagaard
authors.forename: Jeanett
authors.initials: J
authors.lastname: Oestergaard
authors.forename: Marianne
authors.initials: M
authors.lastname: Johansen
authors.forename: Lise Lotte
authors.initials: LL
authors.lastname: Andersen
authors.forename: Charlotte
authors.initials: C
authors.lastname: Ringsted
authors.forename: Bent
authors.initials: B
authors.lastname: Ottesen
authors.forename: Jette L
authors.initials: JL
authors.lastname: Sørensen
mesh_terms: D000328:Adult; D002983:Clinical Competence; D003697:Delphi Technique; D003718:Denmark; D004521:Educational Measurement; D005260:Female; D006801:Humans; D007396:Internship and Residency; D009774:Obstetrics / Q000193:education*; D011247:Pregnancy; D011256:Pregnancy Outcome; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D014620:Vacuum Extraction, Obstetrical / Q000592:standards*