Methodology is more important than statistics when determining reliable change.

McCrea and colleagues (2005) sought to evaluate the efficacy of a multidimensional assessment approach to the management of concussion in contact sport in their article entitled “Standard regression-based methods for measuring recovery after sport-related concussion.” They used the Standardized Regression-Based (SRB) method to determine when an athlete was recovered. Though not in the above article, the SRB is often presented alongside the Reliable Change Index adjusted for practice (RCIp) and the clinician must choose which to use with limited direction. This letter seeks to further elaborate on why the SRB may be preferred and how tighter methodology is perhaps even more important. The general form for any reliable change can be written as: