Differences between the observed and calculated variables. Differences between the observed and calculated variables by multiple-linear regression equations using position parameters of each CA bifurcation are shown in this graph. (a)–(e) represent vA–vE, respectively. There are three sets (Δx´, Δy´, Δz´) of data for patients 1–6 (#1–#6) shown on the X axes of the graphs. Y axes define the translation of CA bifurcation points (mm).