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Is there a reliable change index for common measures such as PCL-M, PHQ-9, GAD-7? We use these as follow-up and outcome measures and nobody on my team can answer this for me.
You can calculate these if you have the numbers. In the validation studies, just pull the test-retest reliability and plug it into the RCI equation. You could also consider clinically significant change.
http://www.personal.kent.edu/~dfresco/CRM_Readings/JCCP_Jacobson_ClinSIG.pdf