Statistics

The coefficient of determination (R²) was used to determine the closeness of fit between measurements obtained with the DLT and the DMS methods. The residual differences between the two methods were measured for each joint in order to quantify the magnitude of the differences, reported here as mean, standard deviation (SD), and maximal residual difference (RD). Although usually used to determine the noninferiority or equivalence between treatments [23], we believe that an equivalence test may help to better characterize the level of similarity between the two methods. Therefore, a Two One-Sided Test (TOST) was implemented to better define the equivalence between the two methods [24]. Seeing, however, that the equivalence margins are not defined in current literature for this type of analysis, we have used the equivalence test to find said margins. This way, we hope to provide at least some quantification of the accuracy between measurement, which may benefit future studies in this field.