Table 3.
Mean (SD) values of the time taken to detect head motion and the associated angular movement threshold during movement sense tests. Values are shown for the initial set of tests performed by all subjects in the validation study (n = 21) on the first test day. Intraclass correlation coefficient (ICC) and standard error of measurement (SEM) values are based on repeated within-day (n = 21) and between-day (n = 19) measurements. Angular movement thresholds are a product of the velocity of movement and the detection time so their ICC values are equivalent to those shown for detection times.
| Extension velocity (deg/s) |
||||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 5 | 10 | 25 | |
| Time to detect head motion (ms): mean (SD) | 799 (406) |
496 (190) |
450 (97) |
439 (95) |
376 (98) |
299 (61) |
|
Within day: ICC Within day: SEM (ms) |
0.88 195 |
0.79 122 |
0.58 89 |
0.66 77 |
0.67 77 |
0.80 45 |
|
Between day: ICC Between day: SEM (ms) |
0.85 217 |
0.86 134 |
0.63 126 |
0.81 71 |
0.79 71 |
0.84 45 |
| Angular movement threshold (°): mean (SD) | 0.80 (0.41) |
0.99 (0.38) |
1.34 (0.29) |
2.19 (0.48) |
3.7 (0.98) |
7.47 (1.53) |
| Within day: SEM (ms) | 0.19 | 0.12 | 0.09 | 0.08 | 0.08 | 0.04 |
| Between day: SEM (ms) | 0.21 | 0.13 | 0.13 | 0.10 | 0.07 | 0.04 |