Using the SEM values obtained from the recent reliability study conducted at the University of Brighton (see appendix 1), side-to-side differences of more than 2×SEM are associated with a 95% probability that the difference is not caused by the inaccuracy of the clinical test. Using the SEM values obtained from this study, it is possible to be 95% confident that the difference identified is not due to an error of measurement when the side-to-side difference is greater than;