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Deconstructing therapy outcome measurement with Rasch analysis of a measure of general clinical distress: the Symptom Checklist-90-Revised

Elliott, Robert and Fox, Christine M. and Beltyukova, Svetlana A. and Stone, Gregory E. and Gunderson, Jennifer and Zhang, Xi (2006) Deconstructing therapy outcome measurement with Rasch analysis of a measure of general clinical distress: the Symptom Checklist-90-Revised. Psychological Assessment, 18 (4). pp. 359-372. ISSN 1040-3590

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    Abstract

    Rasch analysis was used to illustrate the usefulness of item-level analyses for evaluating a common therapy outcome measure of general clinical distress, the Symptom Checklist-90-Revised (SCL-90-R; Derogatis, 1994). Using complementary therapy research samples, the instrument's 5-point rating scale was found to exceed clients' ability to make reliable discriminations and could be improved by collapsing it into a 3-point version (combining scale points 1 with 2 and 3 with 4). This revision, in addition to removing 3 misfitting items, increased person separation from 4.90 to 5.07 and item separation from 7.76 to 8.52 (resulting in alphas of .96 and .99, respectively). Some SCL-90-R subscales had low internal consistency reliabilities; SCL-90-R items can be used to define one factor of general clinical distress that is generally stable across both samples, with two small residual factors.

    Item type: Article
    ID code: 3265
    Keywords: Rasch analysis, therapy, clinical distress, psychotherapy, social psychology, Psychology, Clinical Psychology, Psychiatry and Mental health
    Subjects: Philosophy. Psychology. Religion > Psychology
    Department: Faculty of Humanities and Social Sciences (HaSS) > School of Psychological Science and Health > Counselling
    Related URLs:
      Depositing user: Mr Derek Boyle
      Date Deposited: 01 May 2007
      Last modified: 05 Sep 2014 13:14
      URI: http://strathprints.strath.ac.uk/id/eprint/3265

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