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Clinical significance: A statistical approach to defining meaningful change in psychotherapy research.
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Abstract
In 1984, Jacobson, Follette, and Revenstorf defined clinically significant change
as the extent to which therapy moves someone outside the range of the dysfunctional
population or within the range of the functional population. In the present article,
ways of operationalizing this definition are described, and examples are used to show
how clients can be categorized on the basis of this definition. A reliable change
index (RC) is also proposed to determine whether the magnitude of change for a given
client is statistically reliable. The inclusion of the RC leads to a twofold criterion
for clinically significant change.