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Published online by Cambridge University Press: 16 April 2020
Psychiatric outcome studies (POS) of treatment with psychotherapy as well as pharmacotherapy have the following three psychometric measures in common: (a) The rating of core symptoms; (b) the global clinical assessment; and (c) the rating of social functioning or quality of life.
In the psychometric evaluation of these three outcome measures, effect size is the clinically most meaningful statistic, both in placebo-controlled and in dose-response trials.
The clinically most valid outcome scales and the use of effect size statistics will be shown with reference to the literature on POS.
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