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Why is there no defined normal for RCI?

The RCI or Reliable Change Index is a measure of the change necessary to be considered statistically (and in most cases clinically) significant and not variation that is simply random. The assumption is that some variation is a naturally occurring and frequent phenomenon. When a score is “statistically” different than a comparator, that change is considered reliable and thus important to address in a clinical setting. To determine a reliable change, a distribution of differences is examined, the standard error of measurement along with the reliability of the measure is considered, and then a score difference at or above a defined level is judged significant. Any difference that is not significant can be considered a normal variation.
Updated on 06/20/2018

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