Table 3.
Test–retest reliability of the Health app.
| Parameter | Test | Retest | Bias (95% CI) | 95% LOA | ICC2,1 (95% CI) | SEM (SEM%) | MDC95 (MDC95%) |
|---|---|---|---|---|---|---|---|
| Gait speed (m/s) | |||||||
| Children (n = 12) | 1.34 ± 0.15 | 1.38 ± 0.17 | − 0.04 (− 0.14 to 0.06) | − 0.34 to 0.26 | 0.61 (0.10–0.87) | 0.11 (8.1) | 0.30 (22.4) |
| Adults (n = 20) | 1.37 ± 0.17 | 1.41 ± 0.16 | − 0.04 (− 0.10 to 0.01) | − 0.27 to 0.18 | 0.75 (0.47–0.89) | 0.08 (5.8) | 0.22 (16.0) |
| Seniors (n = 24) | 1.27 ± 0.20 | 1.31 ± 0.23 | − 0.04 (− 0.08 to 0.01) | − 0.23 to 0.16 | 0.88 (0.74–0.95) | 0.07 (5.5) | 0.20 (15.2) |
| Step length (cm) | |||||||
| Children (n = 12) | 68.2 ± 4.5 | 67.3 ± 7.9 | 0.9 (− 3.7 to 5.5) | − 13.2 to 15.0 | 0.39 (0.25–0.78) | 5.1 (7.5) | 14.1 (20.8) |
| Adults (n = 20) | 71.7 ± 7.7 | 72.2 ± 7.6 | − 0.6 (− 2.8 to 1.7) | − 9.9 to 8.8 | 0.80 (0.57–0.92) | 3.4 (4.7) | 9.4 (13.0) |
| Seniors (n = 24) | 66.2 ± 7.7 | 65.9 ± 8.1 | 0.3 (− 1.2 to 2.0) | − 5.8 to 6.4 | 0.93 (0.84–0.97) | 2.2 (3.3) | 6.1 (9.2) |
| Double support time (%) | |||||||
| Children (n = 7) | 25.0 ± 2.9 | 24.6 ± 2.1 | 0.4 (− 1.2 to 2.0) | − 3.0 to 3.8 | 0.79 (0.20–0.96) | 1.2 (4.9) | 3.4 (13.5) |
| Adults (n = 10) | 27.4 ± 2.0 | 27.0 ± 1.4 | 0.4 (− 0.4 to 1.2) | − 1.8 to 2.6 | 0.78 (0.37–0.94) | 0.8 (2.9) | 2.2 (8.1) |
| Seniors (n = 21) | 27.8 ± 2.1 | 27.6 ± 2.2 | 0.2 (− 0.2 to 0.6) | − 1.6 to 2.0 | 0.91 (0.80–0.96) | 0.7 (2.4) | 1.8 (6.5) |
Descriptive data given as mean ± standard deviation.
CI confidence interval, LOA limits of agreement, ICC intraclass correlation coefficient, SEM standard error of measurement, MDC minimal detectable change.