Table 5 Difference between first and second measurement, internal consistency, test-retest reliability, and measurement error of the KOOS subscales
Change from first to second measurement | Internal consistency | Test-retest reliability | Measurement error | |||
|---|---|---|---|---|---|---|
Mean (95% CI) | Cronbach’s α (95% CI) | ICC (95% CI) | SEM (95% CI) | MDC (95% CI) in individuals | MDC (95% CI) in groups | |
Pain | 2.8 (−0.3 to 5.9) | 0.89 (0.84 to 0.94) | 0.86 (0.77 to 0.91) | 7.7 (5.8 to 9.6) | 21.3 (16.5 to 25.1) | 2.8 (2.2 to 3.4) |
Symptoms | −0.7 (−3.2 to 1.9) | 0.79 (0.69 to 0.89) | 0.73 (0.59 to 0.83) | 6.0 (4.7 to 7.3) | 16.6 (13.0 to 20.2) | 2.2 (1.7 to 2.6) |
Activities of Daily Living | 5.1 (1.7 to 8.4) | 0.96 (0.95 to 0.98) | 0.83 (0.72 to 0.89) | 8.7 (6.4 to 11.1) | 24.2 (17.7 to 30.7) | 3.1 (2.3 to 4.0) |
Sport and Recreation Function | 8.7 (3.8 to 13.5) | 0.88 (0.82 to 0.94) | 0.72 (0.57 to 0.82) | 12.2 (9.9 to 14.6) | 33.8 (27.3 to 40.4) | 4.4 (3.6 to 5.3) |
Knee-related Quality of Life | 4.2 (1.0 to 7.4) | 0.90 (0.84 to 0.96) | 0.83 (0.73 to 0.89) | 8.3 (6.8 to 9.8) | 23.1 (19.0 to 27.2) | 3.0 (2.5 to 3.5) |