Teble 1
| IMU1 | IMU2 | 3D | ICC-A* | ICC-B* | SME-A* | SME-B* | RMSE-A* | RMSE-B* | CV-A* | CV-B* | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Frontal flexion (°) | 74.0 (51.0) | 74.1 (52.3) | 72.5 (53.4) | 0.999 (>0.995) | 0.994 (>0.975) | 2.53 | 5.36 | 2.35 | 5.21 | 3.42% | 7.29% |
| Lateral flexion (°) | 49.2 (44.5) | 50.6 (44.8) | 45.1 (43.5) | 0.999 (>0.998) | 0.995 (>0.978) | 1.39 | 4.21 | 1.87 | 5.72 | 2.82% | 8.60% |
| Cervical rotation (°) | 89.2 (62.5) | 91.3 (67.9) | 93.2 (63.2) | 0.993 (>0.967) | 0.996 (>0.981) | 7.88 | 5.73 | 7.64 | 6.67 | 8.90% | 6.45% |
IMU 1, IMU 2: results obtained by the IMU tests (mean (SD)) test/retest. 3D: results obtained by UCOTrack. ICC: intraclass correlation coefficient (value and >95% IC). SME: systematic mean error. RMSE: root mean square error. CV: coefficient of variation. A: comparison test/retest. B: Comparison IMU/3D.