Feature—disease association.

<p>Distributions of three features are displayed by group and by visit. Elbow angle and lifting angle show no group differences as opposed to velocity.</p

Repeatability.

<p>The first column shows the scatter plots of three features for the two assessments of controls within the same day (angles in degrees and velocity in m/s). The second column shows the Bland-Altman plots of the same two assessments. Values are colored by individual IDs of the controls. The third column displays between visit assessments for SMA patients and controls. Measurements from the same subject are connected by lines and are colored by groups.</p

Learning effect.

<p>Total time spent in finishing the test for all visits is plotted with lines connecting the records from the same subject. Thick lines display the linear fit per group, with 95% confidence intervals.</p