Table 4

Change Scores and Standardized Response Means

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)


* Negative sign indicates a worsening in the measured value; positive sign indicates an improvement in the measured value

SD, Standard Deviation

SRM, Standardized Response Mean

n, Number of subjects

CI, Confidence Intervals

Kennedy et al. BMC Musculoskeletal Disorders 2005 6:3   doi:10.1186/1471-2474-6-3

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