Abstract
BACKGROUND CONTEXT: Various methodologies have been utilized in attempting to develop a standard method for calculating Minimum Clinically Important Difference (MCID) to allow assessment of treatment outcomes. A consensus-based decision (IMPACT group) suggested a 30% reduction from baseline as a means to define the MCID of self-report back pain measures. Vital psychometric issues must be addressed regarding use of an independent measure of the same construct as an external criterion, instead of simply another self-report measure when using an anchor-based approach to MCID.
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