title: Development and validation of parallel short forms PaSA-cardio for the assessment of general anxiety in cardiovascular rehabilitation patients using Rasch analysis.
abstract: OBJECTIVE
  To develop and validate parallel short forms for the assessment of general anxiety in cardiovascular rehabilitation patients, that facilitate repeated measurement over time without contamination from residual practice effect variance.
  
  
  METHODS
  Development of the parallel short forms using Rasch analysis. Validation study.
  
  
  METHODS
  Cardiac rehabilitation centres in Germany.
  
  
  METHODS
  Cardiovascular rehabilitation patients.
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  Parallel short forms PaSA-cardio, Hospital Anxiety and Depression Scale, Short Form Health Survey SF-12 and Structured Clinical Interview for DSM-IV Axis I Disorders.
  
  
  RESULTS
  Each version of the parallel short forms (PaSA-cardio-I and PaSA-cardio-II) comprises ten items. The two forms fitted to the Rasch model with a non-significant item-trait interaction (PaSA-cardio-I: chi-square = 39.49, degrees of freedom = 30, probability = 0.12; PaSA-cardio-II: chi-square = 26.56, degrees of freedom = 30, probability = 0.65). Person-separation reliability was 0.75/0.76. Unidimensionality could be verified. Correlation between the two models was 0.94 and 0.95, and correlations with the underlying item bank were 0.95 and 0.93. Validity could be confirmed. The area under the curve was between 0.88 and 0.97 for PaSA-cardio-I and between 0.92 and 0.95 for PaSA-cardio-II.
  
  
  CONCLUSIONS
  Assessment of general anxiety in cardiovascular rehabilitation patients with the PaSA-cardio was valid, economical and accurate. The two forms of the PaSA-cardio are equivalent and allow retest without contamination from residual practice effect variance.
authors.affiliation: 1 Department of Clinical Psychology and Psychotherapy, University of Ulm, Ulm, Germany.
authors.forename: Birgit
authors.initials: B
authors.lastname: Abberger
authors.affiliation: 2 Department of Rehabilitation and Psychotherapy, University of Freiburg, Freiburg, Germany.
authors.forename: Anne
authors.initials: A
authors.lastname: Haschke
authors.affiliation: 3 Discipline of Medicine, University of Adelaide, Adelaide, Australia.
authors.forename: Phillip J
authors.initials: PJ
authors.lastname: Tully
authors.affiliation: 4 Institute of Medical Psychology and Medical Sociology, University Hospital of RWTH Aachen, Aachen, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Forkmann
authors.affiliation: 2 Department of Rehabilitation and Psychotherapy, University of Freiburg, Freiburg, Germany.
authors.forename: Janna
authors.initials: J
authors.lastname: Berger
authors.affiliation: 5 Department of Research Methods, University of Education Freiburg, Freiburg, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Wirtz
authors.affiliation: 2 Department of Rehabilitation and Psychotherapy, University of Freiburg, Freiburg, Germany.
authors.forename: Juergen
authors.initials: J
authors.lastname: Bengel
authors.affiliation: 1 Department of Clinical Psychology and Psychotherapy, University of Ulm, Ulm, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Baumeister
mesh_terms: D000368:Aged; D001008:Anxiety Disorders / Q000175:diagnosis* / Q000209:etiology; D000072038:Cardiac Rehabilitation / Q000523:psychology*; D002318:Cardiovascular Diseases / Q000523:psychology*; D005260:Female; D005858:Germany; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires
keywords: Assessment; anxiety; cardiac rehabilitation; psychometry