Table 3.
Relative and Absolute Reliabilities of Measures for Different Age Groups
| Time I (baseline) | Time II (retest) | N | ICC (95% CI) | SEM | MDC90 | |
|---|---|---|---|---|---|---|
| Grip strength (mean, kg) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 34.78 (12.32) | 36.07 (12.38) | 48 | 0.97 (0.94–0.98) | 2.13 | 4.97 |
| Median (Q1, Q3) | 30.57 (26.34, 44.36) | 31.87 (27.38, 44.92) | ||||
| 65–74 years | ||||||
| Mean (SD) | 35.33 (12.28) | 37.48 (13.04) | 49 | 0.93 (0.84–0.96) | 3.25 | 7.58 |
| Median (Q1, Q3) | 33.7 (23.87, 46.9) | 36.63 (25.12, 48.58) | ||||
| 75+ years | ||||||
| Mean (SD) | 28.29 (9.08) | 34.78 (12.32) | 48 | 0.96 (0.92–0.98) | 1.82 | 4.25 |
| Median (Q1, Q3) | 27.63 (19.88, 35.75) | 28.33 (19.88, 38.1) | ||||
| Grip strength (max, kg) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 36.65 (12.63) | 37.56 (12.84) | 48 | 0.97 (0.95–0.98) | 2.19 | 5.11 |
| Median (Q1, Q3) | 31.65 (27.68, 46.18) | 32.7 (28.8, 46) | ||||
| 65–74 years | ||||||
| Mean (SD) | 37.08 (12.79) | 39.08 (13.23) | 49 | 0.91 (0.84–0.95) | 3.84 | 8.96 |
| Median (Q1, Q3) | 35 (25.05, 48.4) | 38 (26.9, 50.55) | ||||
| 75+ years | ||||||
| Mean (SD) | 29.41 (9.28) | 36.65 (12.63) | 49 | 0.96 (0.93–0.98) | 1.86 | 4.34 |
| Median (Q1, Q3) | 29.5 (21.05, 37) | 29.3 (20.65, 39.55) | ||||
| TUG (seconds) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 9.46 (1.52) | 8.93 (1.01) | 48 | 0.38 (0.12–0.59) | 1.2 | 2.8 |
| Median (Q1, Q3) | 9.24 (8.68, 10.1) | 8.89 (8.34, 9.48) | ||||
| 65–74 years | ||||||
| Mean (SD) | 10.4 (2.47) | 10.02 (2.65) | 50 | 0.85 (0.75–0.91) | 0.96 | 2.24 |
| Median (Q1, Q3) | 10.27 (9.24, 10.81) | 9.49 (8.71, 10.62) | ||||
| 75+ years | ||||||
| Mean (SD) | 11.53 (1.92) | 11.24 (1.98) | 49 | 0.79 (0.66–0.88) | 0.88 | 2.05 |
| Median (Q1, Q3) | 11.31 (10.22, 12.52) | 10.97 (9.69, 13) | ||||
| 4-m gait speed (m/s) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 0.95 (0.13) | 0.98 (0.11) | 48 | 0.33 (0.05–0.55) | 0.11 | 0.26 |
| Median (Q1, Q3) | 0.97 (0.91, 1.05) | 0.96 (0.89, 1.06) | ||||
| 65–74 years | ||||||
| Mean (SD) | 0.91 (0.17) | 0.93 (0.15) | 50 | 0.67 (0.48–0.80) | 0.1 | 0.23 |
| Median (Q1, Q3) | 0.89 (0.82, 1.02) | 0.92 (0.86, 1.02) | ||||
| 75+ years | ||||||
| Mean (SD) | 0.84 (0.15) | 0.83 (0.17) | 49 | 0.69 (0.50–0.81) | 0.08 | 0.19 |
| Median (Q1, Q3) | 0.84 (0.74, 0.92) | 0.83 (0.72, 0.92) | ||||
| Chair rise (seconds) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 11.75 (4.74) | 9.94 (2.33) | 48 | 0.55 (0.26–0.74) | 3.18 | 7.42 |
| Median (Q1, Q3) | 10.49 (8.86, 13.53) | 9.64 (8.51, 11.52) | ||||
| 65–74 years | ||||||
| Mean (SD) | 11.59 (3.11) | 10.36 (2.42) | 48 | 0.70 (0.38–0.85) | 1.7 | 3.97 |
| Median (Q1, Q3) | 11.75 (9.45, 13.3) | 10.30 (9.36, 12.24) | ||||
| 75+ years | ||||||
| Mean (SD) | 13.33 (2.94) | 12.56 (2.66) | 48 | 0.67 (0.47–0.80) | 1.69 | 3.94 |
| Median (Q1, Q3) | 13.68 (10.64, 15.32) | 12.44 (10.28, 13.75) | ||||
| Single-leg stance (right, seconds) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 46.52 (19.57) | 49.12 (19.26) | 48 | 0.78 (0.64–0.87) | 9.18 | 21.42 |
| Median (Q1, Q3) | 60.00 (27.08, 60) | 60.00 (41.55, 60) | ||||
| 65–74 years | ||||||
| Mean (SD) | 25.16 (21.72) | 24.68 (23.27) | 46 | 0.73 (0.55–0.84) | 11.29 | 26.34 |
| Median (Q1, Q3) | 17.41 (5.5, 47.71) | 12.38 (4.44, 58.69) | ||||
| 75+ years | ||||||
| Mean (SD) | 14 (16.87) | 10.4 (14.48) | 46 | 0.30 (0.02–0.54) | 14.04 | 32.76 |
| Median (Q1, Q3) | 8.89 (2.33, 15.6) | 4.06 (2.09, 14.13) | ||||
| Single-leg stance (left, seconds) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 46.01 (19.61) | 44.82 (21.43) | 48 | 0.73 (0.56–0.84) | 10.19 | 23.78 |
| Median (Q1, Q3) | 60.00 (27.2, 60) | 60.00 (21.79, 60) | ||||
| 65–74 years | ||||||
| Mean (SD) | 29.36 (22.97) | 27.15 (23.67) | 46 | 0.76 (0.61–0.86) | 11.25 | 26.25 |
| Median (Q1, Q3) | 21.07 (6.96, 60) | 18.80 (5.29, 60.00) | ||||
| 75+ years | ||||||
| Mean (SD) | 11.89 (15.45) | 10.86 (14.4) | 46 | 0.38 (0.10–0.60) | 12.17 | 28.4 |
| Median (Q1, Q3) | 5.92 (3.15, 13.14) | 4.84 (1.81, 13.62) | ||||
| Single-leg stance (mean, seconds) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 46.26 (18.93) | 46.97 (19.31) | 48 | 0.78 (0.64–0.87) | 8.88 | 20.72 |
| Median (Q1, Q3) | 60.00 (27.35, 60) | 60.00 (33.13, 60) | ||||
| 65–74 years | ||||||
| Mean (SD) | 27.26 (21.21) | 25.91 (22.07) | 46 | 0.80 (0.67–0.89) | 9.49 | 22.14 |
| Median (Q1, Q3) | 25.97 (7.69, 40.2) | 16.44 (6.23, 44.57) | ||||
| 75+ years | ||||||
| Mean (SD) | 12.95 (15.01) | 10.63 (14.05) | 46 | 0.39 (0.11–0.61) | 11.72 | 27.35 |
| Median (Q1, Q3) | 7.25 (3.54, 15.31) | 3.91 (2.31, 13.08) | ||||
| Single-leg stance (max, seconds) | ||||||
| 50–64 years | ||||||
| Mean (SD) | 48.63 (17.08) | 50.17 (18.04) | 48 | 0.76 (0.60–0.86) | 8.37 | 19.53 |
| Median (Q1, Q3) | 60.00 (39.87, 60) | 60.00 (42.78, 60) | ||||
| 65–74 years | ||||||
| Mean (SD) | 31.62 (22.39) | 30.67 (23.27) | 46 | 0.83 (0.71–0.90) | 9.23 | 21.54 |
| Median (Q1, Q3) | 28.41 (9.87, 60) | 24.35 (8.31, 60) | ||||
| 75+ years | ||||||
| Mean (SD) | 16.21 (17.77) | 12.69 (14.86) | 46 | 0.31 (0.03–0.55) | 14.76 | 34.44 |
| Median (Q1, Q3) | 9.39 (5, 18.16) | 5.59 (3.09, 17.94) |
Note: ICC = intraclass correlation coefficient; SEM = standard error of measurement; MDC = minimal detectable change; TUG = Timed Up and Go; SD = standard deviation; Q1 = median of the lower half of the data; Q3 = median of the upper half of the data.