*3.1. Inter-Rater Reliability of Experts' Ratings*

Figure 5 shows the subjective ratings of 21 subjects from three independent experts. The ICC value for three experts was 0.861 (95% CI: 0.688~0.942), which was within the range of 0.75 to 0.9 [41,42], which indicates the experts' ratings were consistent and with good inter-rater reliability.

**Figure 5.** Experts' ratings on motion performance of 21 subjects.
