TABLE V.

Final Metrics Selected by Metric Selection Algorithm

Metric	Senior/Junior Ratio
Safety
Maximum force applied on dura	0.56
Efficiency
Amount of time spent removing L3/total time to completion	0.96
Coordination
Amount of time spent while using suction and burr at the same time	1.73
Number of times structures are touched with suction while using the burr	2.18
Motion of the tools
Distance between 2 acceleration peaks for the burr in the cephalad-caudad axis when removing L3 (consistency of movements of the burr)	1.48
Distance between 2 acceleration peaks for the suction in the medial-lateral axis when removing L3 (consistency of movements of the suction)	0.99
Mean acceleration of the burr in the anterior-posterior axis	0.61
Mean acceleration of the burr in the medial-lateral axis	0.73
Mean acceleration of the suction in the medial-lateral axis	0.46
Mean velocity of the burr when removing ligamentum flavum	1.16
Maximum velocity of the burr when removing ligamentum flavum	0.87
Variance of the pitch angle of the burr when removing L3	0.34