Open AccessPsychometric properties of a Norwegian adaption of the Barratt Impulsiveness Scale‐11 in a sample of Parkinson patients, headache patients, and controls
Author(s) -
Lindstrøm Jonas C.,
Wyller Nora G.,
Halvorsen Marianne M.,
Hartberg Silje,
Lundqvist Christofer
Publication year - 2017
Publication title -
brain and behavior
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 41
ISSN - 2162-3279
DOI - 10.1002/brb3.605
Subject(s) - barratt impulsiveness scale , norwegian , confirmatory factor analysis , cronbach's alpha , exploratory factor analysis , construct validity , psychology , outpatient clinic , clinical psychology , psychometrics , physical therapy , parkinson's disease , medicine , psychiatry , structural equation modeling , disease , impulsivity , statistics , linguistics , philosophy , mathematics
Objective 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. Materials and Methods 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. Results 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. Conclusions 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.