Table 1.
Reliability of G&B App outcomes for all tasks.
| Outcome | Task Qual |
Test Mean ± SD | SEM | SEM% | ICC [95% CI] |
Reliability | ||
|---|---|---|---|---|---|---|---|---|
| Test-1 | Test-2 | |||||||
| Steadiness (−ln[m/s2]) |
Firm | EO | 3.56 ± 0.32 | 3.54 ± 0.31 | 0.2 | 7 | 0.43 [0.23, 0.59] | Poor |
| EC | 3.54 ± 0.27 | 3.52 ± 0.26 | 0.1 | 4 | 0.72 [0.6, 0.81] | Moderate | ||
| Compliant | EO | 3.33 ± 0.29 | 3.39 ± 0.29 | 0.2 | 5 | 0.62 [0.47, 0.74] | Poor | |
| EC | 3.13 ± 0.32 | 3.25 ± 0.32 | 0.1 | 4 | 0.75 [0.51, 0.86] | Moderate | ||
| ML steadiness (−ln[m/s2]) |
Firm | EO | 4.22 ± 0.37 | 4.21 ± 0.35 | 0.3 | 7 | 0.38 [0.18, 0.55] | Poor |
| EC | 4.26 ± 0.31 | 4.25 ± 0.29 | 0.2 | 4 | 0.71 [0.59, 0.8] | Moderate | ||
| Compliant | EO | 3.93 ± 0.31 | 4.04 ± 0.32 | 0.2 | 5 | 0.56 [0.37, 0.7] | Poor | |
| EC | 3.8 ± 0.35 | 3.94 ± 0.35 | 0.2 | 4 | 0.7 [0.45, 0.83] | Poor | ||
| AP steadiness (−ln[m/s2]) |
Firm | EO | 4.17 ± 0.28 | 4.14 ± 0.29 | 0.2 | 5 | 0.52 [0.35, 0.66] | Poor |
| EC | 4.08 ± 0.28 | 4.07 ± 0.26 | 0.2 | 4 | 0.69 [0.56, 0.79] | Moderate | ||
| Compliant | EO | 3.97 ± 0.3, | 4.01 ± 0.29 | 0.2 | 5 | 0.6 [0.45, 0.72] | Poor | |
| EC | 3.69 ± 0.32 | 3.81 ± 0.31 | 0.2 | 4 | 0.71 [0.49, 0.83] | Poor | ||
| Walking speed (m/s) | Walking | HF | 0.82 ± 0.19 | 0.85 ± 0.2 | 0.05 | 6 | 0.93 [0.89, 0.96] | High |
| Gait symmetry (%) | 64 ± 5 | 64 ± 5 | 3.00 | 5 | 0.65 [0.5, 0.76] | Moderate | ||
| Step length (m) | 0.57 ± 0.07 | 0.57 ± 0.07 | 0.02 | 3 | 0.94 [0.91, 0.96] | Excellent | ||
| Step time (s) | 0.64 ± 0.08 | 0.63 ± 0.08 | 0.03 | 5 | 0.84 [0.76, 0.89] | High | ||
| Step length variability (%) | 6 ± 4 | 6 ± 6 | 4.00 | 77 | 0.16 [−0.06, 0.36] | Poor | ||
| Step time variability (%) | 7 ± 4 | 6 ± 5 | 3.00 | 47 | 0.51 [0.33, 0.65] | Poor | ||
| Step length asymmetry (%) | 4 ± 4 | 4 ± 4 | 2.00 | 56 | 0.6 [0.44, 0.72] | Poor | ||
| Step time asymmetry (%) | 4 ± 4 | 5 ± 4 | 2.00 | 47 | 0.68 [0.55, 0.78] | Moderate | ||
| Walking speed (m/s) | Walking | HT | 0.91 ± 0.18 | 0.91 ± 0.18 | 0.06 | 6 | 0.89 [0.84, 0.93] | High |
| Gait symmetry (%) | 59 ± 7 | 60 ± 7 | 4.00 | 7 | 0.63 [0.47, 0.74] | Poor | ||
| Step length (m) | 0.54 ± 0.08 | 0.55 ± 0.09 | 0.02 | 4 | 0.92 [0.88, 0.95] | High | ||
| Step time (S) | 0.67 ± 0.09 | 0.66 ± 0.09 | 0.04 | 5 | 0.84 [0.76, 0.89] | High | ||
| Step length variability (%) | 7 ± 4 | 7 ± 6 | 4.00 | 62 | 0.25 [0.03, 0.44] | Poor | ||
| Step time variability (%) | 8 ± 5 | 7 ± 5 | 4.00 | 54 | 0.4 [0.21, 0.57] | Poor | ||
| Step length variability (%) | 5 ± 4 | 5 ± 4 | 3.00 | 62 | 0.59 [0.44, 0.72] | Poor | ||
| Step time variability (%) | 5 ± 5 | 5 ± 5 | 3.00 | 66 | 0.52 [0.35, 0.66] | Poor | ||
SEM = standard error of measurement expressed in the outcome units; ICC = intraclass correlation coefficient; SEM% = percentage representation of the standard error of measurement in relation to the mean of the outcome; EO = eyes open; EC = eyes closed; HF = head forward; HT = head turning.