Content of the questionnaire
Target audienceAdults
ApplicationThe Outcome Questionnaire (OQ45/OQ45.2) has been developed to track change, progress and outcome of treatments of psychological disorders and problems. This is called routine outcome monitoring (ROM) and has become one of the most important tools of quality management in mental healthcare. The OQ-45 is one of the most used ROM istruments in the world. It is not used for diagnostics.
CompositionThe 45 items of the OQ-45 are rated on 5-point Likert scales from “never” to “almost always”. These items form a total score as well as the three scales symptom distress, interpersonal relations and social integration.
Psychometric properties
Reliability & ValidityThe psychometric properties of the OQ-45 have been investigated in multiple studies. They reached good to excellent values. The internal consistency of the total scale for example was .93 (Cronbach’s Alpha) and the test-retest reliability .84. Meaningful relations to relevant instruments have also been demonstrated.
Literature and copyright

The Outcome Questionnaire. Lambert, Michael J.; Finch, Arthur E. Maruish, Mark E. (Ed), (1999). The use of psychological testing for treatment planning and outcomes assessment (2nd ed.), (pp. 831-869). Mahwah, NJ, US: Lawrence Erlbaum Associates Publishers

Lambert, M. J., Whipple, J. L., Hawkins, E. J., Vermeersch, D. A., Nielsen, S. L., & Smart, D. W. (2003). Is it time for clinicians to routinely track patient outcome? A meta‐analysis. Clinical Psychology: Science and Practice, 10(3), 288-301.

Puschner, B., Cosh, S., & Becker, T. (2015). Patient-rated outcome assessment with the German version of the Outcome Questionnaire 45 in people with severe mental illness. European Journal of Psychological Assessment.

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