Table 2b.

Summary of Linear Knee-Extension ROM Analysis

Effects	Unconditional Model β (95% CI)	Conditional on Pre-arthroplasty Extension β (95% CI)
Mixed-Effects Analysis
Fixed Effects
Parameters of Average Change
slope*	−0.77 (−1.08–−0.45)	−0.74 (−1.05–−0.43)
y-intercept	3.82 (2.98–4.66)	3.26 (2.28–4.24)
pre-extension**	N/A	0.09 (0.01–0.17)
Random Effects
Standard deviation of individual differences from average
y-intercept	1.49	1.43
Within patient	2.98	2.98
Robust Analysis
Regression Coefficients
slope*	−0.74 (−1.09–−0.39)	−0.70 (−1.05–−0.35)
y-intercept	3.83 (2.91–4.75)	3.24 (2.14–4.34)
pre-extension**	N/A	0.09 (0–0.19)

^*Standard error

^**Pre-arthroplasty extension range