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Table 3 Degree of accuracy for different sensor combinations at all three levels of classification—without transitions

From: Development of a Human Activity Recognition System for Ballet Tasks

 Level 1Level 2Level 3
Number of sensors (number of possible sensor combinations)Accuracy score mean (range)BestWorstAccuracy score mean (range)BestWorstAccuracy score mean (range)BestWorst
5 (6)98.2% (98–98.5%)L shin
L thigh
R shin
R thigh Sacrum
L thigh
L shin
R thigh
Sacrum
Thoracic
81.8% (81.3–81.8%)L shin
L thigh
R shin
R thigh
Sacrum
L shin
L thigh
R thigh
Sacrum
Thoracic
74.9% (74.1–76.3%)L shin
L thigh
R shin
R thigh Sacrum
L shin
L thigh
R thigh
Sacrum
Thoracic
4 (15)98.1% (97.8–98.4%)L shin
L thigh
R shin
R thigh
L thigh
R shin
R thigh
Sacrum
81.3% (79.3–82.4%)L shin
R shin
R thigh
Sacrum
L shin
L thigh Sacrum Thoracic
73.8% (71.8–75.1%)L shin
R shin
R thigh
Sacrum
R shin
R thigh
Sacrum
Thoracic
3 (20)98% (97.6–98.2%)L shin
R thigh
Sacrum
R shin
Sacrum
Thoracic
79.5% (73.7–81.7%)L shin
R shin
Sacrum
L shin
L thigh Thoracic
72.0% (65.2–74.5%)L shin
R thigh
Sacrum
L shin
L thigh Thoracic
2 (15)97.7% (97.2–98.1%)L shin
R thigh
Sacrum
Thoracic
75.8% (69.7–80.2%)L shin
R thigh
L shin
L thigh
68.0% (61.5–72.5%)L shin
R thigh
L shin
Thoracic
1 (6)97.3% (97–97.7%)R thighR shin67.1% (60.2–76.5%)SacrumThoracic56.5% (38.0–65.3%)SacrumThoracic