Table 4 Model Parameter Estimates for the Six Minute Walk Test
From: Modeling early recovery of physical function following hip and knee arthroplasty
| Â | 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 |
| Â | Slope (weeks after surgery) | 32.05 (24.84, 39.26) p < .0005 |
| Â | Quadratic (weeks)2 | -1.70 (-2.03, -1.37) p < .0005 |
| Â | 6 MWT Baseline Score | .126 (.0002, .253) p = .05 |
| Â | Interaction of weeks after surgery by baseline score | .036 (.023, .048) p < .0005 |
| Â | Gender | If female, -60.12 (-85.69, -34.55) p < .0005 |
| Â | Site of arthroplasty (THA or TKA) | If TKA, 48.30 (19.91, 76.68) p = .001 |
| Â | Interaction of weeks after surgery by site of arthroplasty | If TKA, -3.70 (-7.05, -.353) p = .030 |
| Â | Â | Standard Deviation |
Variance Estimates | Within Patient Residual | 56.20 |
| Â | Intercept | 53.70 |