Table 2.
Impact of autonomous quality control of orientation data sequences per task and joint.
| Original Data | Cleaned-up Data (ANN) | |||||
|---|---|---|---|---|---|---|
| Ntotal | Ngood | RMSDtotal | Naccepted | RMSDaccepted | ||
| Sit | Trunk | 180 | 177 | 0.9° (1.4°) | 177 | 0.7° (0.6°) |
| Hip | 180 | 177 | 0.7° (2.5°) | 178 | 0.5° (0.6°) | |
| Knee | 180 | 177 | 0.9° (2.8°) | 178 | 0.7° (1.0°) | |
| Ankle | 177 | 159 | 3.4° (10.1°) | 157 | 1.2° (2.2°) | |
| STS | Trunk | 175 | 120 | 4.2° (2.5°) | 113 | 3.6° (2.0°) |
| Hip | 175 | 165 | 2.1° (1.9°) | 177 | 2.1° (1.9°) | |
| Knee | 180 | 167 | 2.4° (2.3°) | 169 | 2.2° (1.7°) | |
| Ankle | 176 | 122 | 5.8° (9.4°) | 124 | 3.8° (3.7°) | |
| Walk | Trunk | 349 | 266 | 4.3° (4.5°) | 325 | 4.2° (4.0°) |
| Hip | 349 | 301 | 3.5° (4.0°) | 331 | 3.3° (3.3°) | |
| Knee | 359 | 260 | 4.3° (2.5°) | 275 | 4.2° (2.4°) | |
| Ankle | 351 | 51 | 14.3° (12.4°) | 7 | 5.1° (2.4°) | |
| Turn | Trunk | 166 | 117 | 4.1° (2.5°) | 141 | 4.0° (2.3°) |
| Hip | 166 | 133 | 3.8° (1.8°) | 161 | 3.8° (1.9°) | |
| Knee | 180 | 108 | 4.7° (2.6°) | 81 | 4.5° (2.3°) | |
| Ankle | 176 | 18 | 15.2° (10.9°) | 2 | 6.4° (0.2°) | |
| Turn-to-sit | Trunk | 168 | 118 | 4.4° (3.5°) | 157 | 4.5° (3.6°) |
| Hip | 168 | 126 | 3.9° (2.0°) | 161 | 3.8° (1.9°) | |
| Knee | 165 | 108 | 5.6° (5.7°) | 62 | 4.1° (2.5°) | |
| Ankle | 159 | 53 | 12.5° (15.2°) | 26 | 6.0° (4.5°) | |
Note: Ntotal—number of data; Ngood—number of good data (i.e., RMSD ≤ 5°); RMSDtotal—Mean (std dev.) root-mean-square difference between AHRS joint orientation and reference joint orientation (all data); Nkept—number of data classified as good by the ANN; RMSDaccepted—Mean (std dev.) root-mean-square difference between AHRS joint orientation accepted by the ANN and their reference joint orientation.