A score greater than one on the reliable change index indicates that there was more change from pretest to posttest than the measurement error in the instrument.

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The Reliable Change Index (RCI) is a statistical calculation used to determine whether the change observed in a person's scores on a psychological test or assessment is due to true change or just measurement error. A score greater than one on the RCI indicates that the change observed is greater than what would be expected due to measurement error alone, so it is considered a significant positive change.

A Score Greater Than One on the Reliable Change Index