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The dosage model provides a normative estimate of the overall pattern of patient improvement in psychotherapy. The phase model further specifies patterns of change in the domains of subjective well-being, symptom remediation, and functioning. The expected treatment response (ETR) approach uses patient characteristics to predict an expected path of progress for each patient. With repeated measures of mental health status, the treatment progress of an individual patient can be assessed against the patient's ETR to support decisions that would enhance the quality of a clinical service while it is being delivered.
Lueger et al. (Mon,) studied this question.