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Table 2 Reliability Coefficients and Minimal Level of Detectable Change

From: Assessing stability and change of four performance measures: a longitudinal study evaluating outcome following total hip and knee arthroplasty

Measure R (95% CI) SEM (95% CI) Confidence in Score (90% CI) MDC90
Fast Self-paced Walk Time (completed over 40 meters) 0.91 (0.81, 0.97) 1.73 (1.39, 2.29) ± 2.86 s 4.04 s
Stair Time 0.90 (0.79, 0.96) 2.35 (1.89, 3.10) ± 3.88 s 5.49 s
Timed Up and Go Time 0.75 (0.51, 0.89) 1.07 (0.86, 1.41) ± 1.76s 2.49 s
Six Minute Walk Test Distance 0.94 (0.88, 0.98) 26.29 (21.14, 34.77) ± 43.37 m 61.34 m
  1. R, Reliability Coefficient
  2. SEM, Standard Error of Measurement
  3. MDC90, Minimal detectable change at the 90% confidence Level
  4. s, seconds
  5. m, meters