title: Psychometric properties of a Norwegian adaption of the Barratt Impulsiveness Scale-11 in a sample of Parkinson patients, headache patients, and controls.
abstract: To assess the psychometric properties of a Norwegian translation of the Barratt Impulsiveness Scale (BIS-11) for use in populations of headache, Parkinson's disease (PD), and healthy controls.
  
  
  
  The BIS-11 was forward and backward translated by native speakers of both Norwegian and English to give Norwegian BIS-11 (Nor-BIS-11). A convenience sample (110 subjects) of healthy controls (47), PD patients (43), and chronic headache patients (20) (the latter two recruited from a Neurology outpatient clinic), were asked to complete the scale (a subset twice for test-retest). Exploratory and confirmatory factor analyses were done for a single-factor model, the original three-factor model and a two-factor model. Test-retest results were analyzed using the Bland-Altman approach.
  
  
  
  The Nor-BIS-11 scale showed good utility and acceptability as well as good test-retest reliability in this sample. Cronbach's α was .68, test-retest bias was -0.73, Cohen's δ = -.134, and limits of agreement were -11.48 to 10.01. The factor structure was found to fit better with a two-factor model than with the original model with three factors. The model fit indices indicated a moderate fit.
  
  
  
  The Nor-BIS-11 scale is acceptable and reliable to use in Parkinson's disease patients, chronic headache patients, and healthy controls. The results should be interpreted in a two-factor model but with caution due to low construct validity. External validity needs to be further tested.
authors.affiliation: Health Services Research Centre (HØKH)Akershus University HospitalLørenskogNorway; Institute of Clinical MedicineCampus Akershus University HospitalUniversity of OsloOsloNorway.
authors.forename: Jonas C
authors.initials: JC
authors.lastname: Lindstrøm
authors.affiliation: Health Services Research Centre (HØKH) Akershus University Hospital Lørenskog Norway.
authors.forename: Nora G
authors.initials: NG
authors.lastname: Wyller
authors.affiliation: Health Services Research Centre (HØKH) Akershus University Hospital Lørenskog Norway.
authors.forename: Marianne M
authors.initials: MM
authors.lastname: Halvorsen
authors.affiliation: Health Services Research Centre (HØKH) Akershus University Hospital Lørenskog Norway.
authors.forename: Silje
authors.initials: S
authors.lastname: Hartberg
authors.affiliation: Health Services Research Centre (HØKH)Akershus University HospitalLørenskogNorway; Institute of Clinical MedicineCampus Akershus University HospitalUniversity of OsloOsloNorway; Department of NeurologyAkershus University HospitalLørenskogNorway.
authors.forename: Christofer
authors.initials: C
authors.lastname: Lundqvist
mesh_terms: D000328:Adult; D005260:Female; D020773:Headache Disorders; D006801:Humans; D007175:Impulsive Behavior; D008297:Male; D008875:Middle Aged; D009664:Norway; D010300:Parkinson Disease; D011569:Psychiatric Status Rating Scales / Q000592:standards*; D011594:Psychometrics / Q000295:instrumentation*; D015203:Reproducibility of Results; D055815:Young Adult
keywords: Barratt Impulsiveness Scale; Parkinson's disease; headache; impulsivity; reliability; validity