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Table 4 Model Parameter Estimates for the Six Minute Walk Test

From: Modeling early recovery of physical function following hip and knee arthroplasty

  Parameter Six Minute Walk Test Estimate (95% CI) Level of Significance
Fixed Effect Estimates Intercept (mean distance in meters at 1 week) 142.34 (80.93, 203.76) p < .0005
  Slope (weeks after surgery) 32.05 (24.84, 39.26) p < .0005
  Quadratic (weeks)2 -1.70 (-2.03, -1.37) p < .0005
  6 MWT Baseline Score .126 (.0002, .253) p = .05
  Interaction of weeks after surgery by baseline score .036 (.023, .048) p < .0005
  Gender If female, -60.12 (-85.69, -34.55) p < .0005
  Site of arthroplasty (THA or TKA) If TKA, 48.30 (19.91, 76.68) p = .001
  Interaction of weeks after surgery by site of arthroplasty If TKA, -3.70 (-7.05, -.353) p = .030
   Standard Deviation
Variance Estimates Within Patient Residual 56.20
  Intercept 53.70
  1. Abbreviations: CI, Confidence Interval
  2. 6 MWT, Six Minute Walk Test
  3. TKA, Total Knee Arthroplasty
  4. THA, Total Hip Arthroplasty