Table 3.
Validity of Gait&Balance App outcomes for quiet stance tasks against force plate.
| Task (Number) | Qual | Outcome | FP Outcome | r [95% CI] | Correlation |
|---|---|---|---|---|---|
| Firm (tasks 1&2) | EO | Steadiness | Total distance wandered | −0.7 [−0.8, −0.55] | (−)Adequate |
| Min-step distance | −0.54 [−0.68, −0.35] | (−)Adequate | |||
| Max-step distance | −0.53 [−0.68, −0.34] | (−)Adequate | |||
| ML steadiness | Total ML sway | −0.47 [−0.64, −0.27] | (−)Poor | ||
| AP steadiness | Total AP sway | −0.34 [−0.53, −0.11] | (−)Poor | ||
| EC | Steadiness | Total distance wandered | −0.83 [−0.89, −0.73] | (−)Excellent | |
| Min-step distance | −0.57 [−0.71, −0.39] | (−)Adequate | |||
| Max-step distance | −0.7 [−0.8, −0.55] | (−)Adequate | |||
| ML steadiness | Total ML sway | −0.6 [−0.73, −0.42] | (−)Adequate | ||
| AP steadiness | Total AP sway | −0.46 [−0.63, −0.25] | (−)Poor | ||
| Compliant (tasks 3&4) | EO | Steadiness | Total distance wandered | −0.73 [−0.82, −0.59] | (−)Adequate |
| Min-step distance | −0.31 [−0.51, −0.08] | (−)Poor | |||
| Max-step distance | −0.02 [−0.26, 0.22] | (−)Poor | |||
| ML steadiness | Total ML sway | −0.31 [−0.51, −0.08] | (−)Poor | ||
| AP steadiness | Total AP sway | −0.15 [−0.37, 0.09] | (−)Poor | ||
| EC | Steadiness | Total distance wandered | −0.9 [−0.94, −0.85] | (−)Excellent | |
| Min-step distance | −0.29 [−0.49, −0.05] | (−)Poor | |||
| Max-step distance | −0.83 [−0.89, −0.74] | (−)Excellent | |||
| ML steadiness | Total ML sway | −0.59 [−0.72, −0.41] | (−)Adequate | ||
| AP steadiness | Total AP sway | −0.58 [−0.72, −0.4] | (−)Adequate |
EO = eyes open; EC = eyes closed; CI = confidence intervals; FP = force plate: AP = anteroposterior; ML = mediolateral. (−) Negative Correlation; Unit for steadiness = −ln[m/s2].