Table 2. Intra-rater reliability and measurement error statistics.
| ICC (95% CI) |
SEM, % (95% CI) |
Error in an individual’s score, % |
MDC90, % | ||
|---|---|---|---|---|---|
| 10-m walking time (sec) | |||||
| Comfortable speed | 0.96 (0.92–0.98) | 1.49 (1.22–1.92) | ± 2.4 | 3.5 | |
| Maximum speed | 0.93 (0.86–0.97) | 1.68 (1.35–2.19) | ± 2.8 | 3.9 | |
| Gait cadence (steps/min) | |||||
| Comfortable speed | 0.96 (0.93–0.98) | 1.46 (1.26–1.75) | ± 2.4 | 3.4 | |
| Maximum speed | 0.94 (0.89–0.98) | 1.77 (1.44–2.30) | ± 2.9 | 4.1 | |
| Peak absolute value of acceleration vectors (m/sec2) | |||||
| Comfortable speed | 0.97 (0.93–0.99) | 1.25 (1.02–1.63) | ± 2.1 | 2.9 | |
| Maximum speed | 0.96 (0.93–0.97) | 1.62 (1.40–1.93) | ± 2.7 | 3.8 | |
Error in an individual’s score estimated at 90% confidence level. ICC: intraclass correlation coefficient; 95% CI: 95% confidence interval; SEM: standard error of measurement; MDC90: minimum detectable change at 90% confidence level