title: Psychometric properties of a Swedish version of the Pearlin Mastery Scale in people with mental illness and healthy people.
abstract: BACKGROUND
  Mastery refers to the degree to which people perceive that they can control factors that influence their life situation, and has been found important for people's quality of life and well-being. It is thus essential to be able to measure mastery in a valid and reliable way.
  
  
  OBJECTIVE
  This study aimed at using the Rasch measurement model to investigate the psychometric properties of a Swedish version of the Pearlin Mastery Scale (Mastery-S).
  
  
  METHODS
  A sample of 300 healthy individuals and 278 persons with mental illness responded to the Mastery-S. Item responses were Rasch analysed regarding model fit, response category functioning, differential item functioning (DIF) and targeting, using the partial credit model.
  
  
  RESULTS
  The Mastery-S items represented a logical continuum of the measured construct but one item displayed misfit. Reliability (Person Separation Index) was 0.7. The response categories did not work as expected in three items, which could be corrected for by collapsing categories. Three items displayed DIF between the two subsamples, which caused a bias when comparing mastery levels between subsamples, suggesting the Mastery-S is not truly generic.
  
  
  CONCLUSIONS
  The Mastery-S may be used to obtain valid and reliable data, but some precautions should be made. If used to compare groups, new analyses of DIF should first be made. Users of the scale should also consider exempting item 6 from the scale and analyse it as a separate item. Finally, rewording of response categories should be considered in order to make them more distinct and thereby improve score reliability.
authors.affiliation: Department of Health Sciences, Lund University, Sweden.
authors.forename: Mona
authors.initials: M
authors.lastname: Eklund
authors.forename: Lena-Karin
authors.initials: LK
authors.lastname: Erlandsson
authors.forename: Peter
authors.initials: P
authors.lastname: Hagell
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007389:Internal-External Control; D008297:Male; D001523:Mental Disorders / Q000503:physiopathology / Q000523:psychology*; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D013548:Sweden