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Table 4 Change Scores and Standardized Response Means

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

Measure Preop to First Postop Interval Mean Change*, SD, n SRM* (95% CI) First to Second Postop Interval Mean Change*, SD, n SRM* (95% CI)
Self-paced Walk Time (seconds) -54.8, 61.6, 115
-0.89 (-1.42, -0.68)
47.7, 60.7, 89
0.79 (0.66, 1.45)
Stair Time (seconds) -23.8, 13.8, 87
-1.74 (-2.13, -1.45)
20.59, 10.40, 73
1.98 (1.68, 2.42)
Timed Up and Go Time (seconds) -14.9, 13.8, 116
-1.08 (-1.38, -0.92)
13.57, 13.04, 89
1.04 (0.84, 1.61)
Six minute Walk Test Distance (meters) -232, 133, 82
-1.74 (1.60, 1.97)
207, 109, 61
1.90 (1.46, 2.39)
  1. * Negative sign indicates a worsening in the measured value; positive sign indicates an improvement in the measured value
  2. SD, Standard Deviation
  3. SRM, Standardized Response Mean
  4. n, Number of subjects
  5. CI, Confidence Intervals