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Psychometric properties of a Swedish version of the Pearlin Mastery Scale in people with mental illness and healthy people.

Eklund, Mona LU ; Erlandsson, Lena-Karin LU and Hagell, Peter LU (2012) In Nordic Journal of Psychiatry 66(6). p.380-388
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.



Aim: 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... (More)
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.



Aim: 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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nordic Journal of Psychiatry
volume
66
issue
6
pages
380 - 388
publisher
Informa Healthcare
external identifiers
  • wos:000310078400003
  • pmid:22339394
  • scopus:84867884141
ISSN
1502-4725
DOI
10.3109/08039488.2012.656701
language
English
LU publication?
yes
id
cc5cfd3e-b520-4958-97a8-9f7182b698ac (old id 2366813)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/22339394?dopt=Abstract
date added to LUP
2012-03-02 12:06:37
date last changed
2017-11-19 03:21:36
@article{cc5cfd3e-b520-4958-97a8-9f7182b698ac,
  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. <br/><br>
<br/><br>
Aim: 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). <br/><br>
<br/><br>
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. <br/><br>
<br/><br>
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. <br/><br>
<br/><br>
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.},
  author       = {Eklund, Mona and Erlandsson, Lena-Karin and Hagell, Peter},
  issn         = {1502-4725},
  language     = {eng},
  number       = {6},
  pages        = {380--388},
  publisher    = {Informa Healthcare},
  series       = {Nordic Journal of Psychiatry},
  title        = {Psychometric properties of a Swedish version of the Pearlin Mastery Scale in people with mental illness and healthy people.},
  url          = {http://dx.doi.org/10.3109/08039488.2012.656701},
  volume       = {66},
  year         = {2012},
}