Table 2.
Concurrent validity of the acceleration values obtained from the glasses compared to the OptiTrack.
| Pearson Correlation (r) | Bland-Altman | |||||
|---|---|---|---|---|---|---|
| Session 1 | Session 2 | Global | Bias (Mean Difference) | Lower Limit | Upper Limit | |
| VA | ||||||
| Comfort WCC | 0.78 *** | 0.60 *** | 0.72 *** | −9.73 | −12.10 | −7.35 |
| Comfort CC | 0.62 *** | 0.37 *** | 0.52 *** | −8.29 | −11.30 | −5.29 |
| Slow WCC | 0.94 *** | 0.94 *** | 0.94 *** | −9.84 | −11.12 | −8.56 |
| Slow CC | 0.76 *** | 0.80 *** | 0.76 *** | −8.84 | −10.89 | −6.79 |
| APA | ||||||
| Comfort WCC | 0.41 *** | 0.36 *** | 0.38 *** | 0.28 | −2.33 | 2.88 |
| Comfort CC | 0.43 *** | 0.61 *** | 0.53 *** | 0.97 | −1.24 | 3.18 |
| Slow WCC | 0.42 *** | 0.48 *** | 0.46 *** | −0.07 | −2.46 | 2.31 |
| Slow CC | 0.54 *** | 0.43 *** | 0.48 *** | 0.64 | −1.84 | 3.12 |
*** indicates significant correlation between systems (p < 0.001). Abbreviations: WCC, without cervical collar; CC, with cervical collar; APA, anteroposterior axis; VA, vertical axis.