QLiS-SF: development of a short form of the quality of life in schizophrenia questionnaire

Background: There is a need for useful standardized Quality of Life (QoL) measures for people diagnosed with schizophrenia. Therefore, a short form of the self-administered Quality of Life in Schizophrenia (QLiS) scale was developed and validated. Methods: Four steps were taken to develop the abridg...

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Hauptverfasser: Senin, Tatjana (VerfasserIn) , Deuschle, Michael (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 27 April 2017
In: BMC psychiatry
Year: 2017, Jahrgang: 17
ISSN:1471-244X
DOI:10.1186/s12888-017-1307-1
Online-Zugang:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1186/s12888-017-1307-1
Verlag, kostenfrei, Volltext: https://doi.org/10.1186/s12888-017-1307-1
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Verfasserangaben:T. Senin, M. Franz, M. Deuschle, N. Bergemann, J. Kammerer-Ciernioch, M. Lautenschlager and T. Meyer

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520 |a Background: There is a need for useful standardized Quality of Life (QoL) measures for people diagnosed with schizophrenia. Therefore, a short form of the self-administered Quality of Life in Schizophrenia (QLiS) scale was developed and validated. Methods: Four steps were taken to develop the abridged version using samples from the Clinical Analysis of the Treatment of Schizophrenia (CATS) study. Firstly, a model with second order scales was developed using exploratory factor analysis (EFA). Secondly, it was tested in an independent sample using confirmatory factor analysis (CFA). Thirdly, this model served as the basis for selecting items for the short form. Distributional properties, content reviews, and factor loadings were taken into account in this step. Fourthly, the resulting short form was validated through confirmatory factor analysis (CFA). Composite reliability scores were calculated for the new subscales. Results: Three second order scales were constructed: illness-related quality of life (QoL), social life and finances, and global subjective well-being. CFA of the new theoretical model resulted in a CFI of 0.67 and absolute fit indices of CMIN/df = 2.55, RMSEA = 0.08, SRMR = 0.09. The selected 13 items showed good statistical properties and good fit of content to subscale. Fit of the underlying theoretical model with the reduced number of items was tested in an independent sample. Absolute and fit indices of the short form model were satisfactory (CFI = 0.95, CMIN/df = 2.23, RMSEA = 0.06, SRMR = 0.04). Composite reliability scores for three subscales were above 0.70. Conclusions: The short form of the QLIS (QLiS-SF) showed good model fit and reliability. It should only be considered for use if the application of the long version is not suitable. 
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