Table 3.
Concurrent validity (i.e., between-systems agreement) for spatiotemporal gait parameters of instructed slow walking speed (SWS), comfortable walking speed (CWS) and fast walking speed (FWS) conditions in healthy young adults (HYA) and CWS in people with Parkinson’s disease (PD), presented for trial 1.
| Interactive Walkway | HoloLens | ||||||
|---|---|---|---|---|---|---|---|
| Mean ± SD | Mean ± SD | Bias (95% LoA) | t-Statistics | ICC(A,1) | |||
| Walking speed | HYA | SWS | 76.1 ± 13.0 | 74.2 ± 12.6 | 1.9 (0.9 2.9) | t(21) = 17.63, p < 0.001 * | 0.988 |
| (cm/s) | CWS | 119.6 ± 16.8 | 116.2 ± 16.2 | 3.4 (1.9 5.0) | t(21) = 20.36, p < 0.001 * | 0.978 | |
| FWS | 182.3 ± 22.9 | 176.3 ± 21.8 | 6.0 (3.2 8.8) | t(21) = 19.58, p < 0.001 * | 0.963 | ||
| PD | CWS | 105.2 ± 21.4 | 104.5 ± 20.7 | 0.7 (−2.0 3.3) | t(22) = 2.32, p = 0.030 * | 0.998 | |
| Step length | HYA | SWS | 57.5 ± 6.6 | 56.2 ± 6.4 | 1.3 (−0.2 2.7) | t(21) = 9.08, p < 0.001 * | 0.973 |
| (cm) | CWS | 69.6 ± 7.1 | 67.9 ± 7.0 | 1.7 (−0.8 4.2) | t(21) = 6.18, p < 0.001 * | 0.956 | |
| FWS | 89.1 ± 8.2 | 86.2 ± 8.0 | 2.9 (0.4 5.4) | t(21) = 10.82, p < 0.001 * | 0.928 | ||
| PD | CWS | 58.4 ± 11.8 | 57.8 ± 11.5 | 0.6 (−2.0 3.3) | t(22) = 2.17, p = 0.041 * | 0.992 | |
| Cadence | HYA | SWS | 79.4 ± 10.2 | 79.2 ± 9.8 | 0.3 (−1.4 2.0) | t(21) = 1.61, p = 0.123 | 0.996 |
| (steps/min) | CWS | 104.3 ± 8.5 | 103.8 ± 8.5 | 0.4 (−1.8 2.7) | t(21) = 1.73, p = 0.097 | 0.990 | |
| FWS | 125.7 ± 11.5 | 124.1 ± 10.4 | 1.6 (−3.5 6.7) | t(21) = 2.89, p = 0.009 * | 0.963 | ||
| PD | CWS | 110.3 ± 7.7 | 109.6 ± 7.6 | 0.7 (−1.1 2.6) | t(22) = 3.75, p = 0.001* | 0.988 |
Abbreviations: SD = between-subjects standard deviation; LoA = limits of agreement; ICC(A,1) = intraclass correlation coefficient for absolute agreement. * Significant between-systems difference (p < 0.05).