Table 1.

The relationship between the outcome/dependent variables and potential predictors (simple linear regression analysis model) at baseline (preoperative period)

Variable	β	t-value	95% CI	p value
Peak knee flexion
Age	−0.28	−0.45	−1.53–0.96	0.65
GMFM	0.03	0.56	−0.09–0.15	0.58
GV	0.04	0.99	−0.04–0.13	0.32
PA	−0.01	−0.09	−0.18–0.16	0.93
Knee ROM
Age	−0.26	−0.37	−1.70–1.17	0.71
GMFM	−0.03	−0.41	−0.17–0.11	0.68
GV	0.01	0.28	−0.08–0.11	0.78
PA	0.02	0.17	−0.18–0.21	0.86
Timing of peak knee flexion
Age	−0.003	−1.01	−0.009–0.003	0.31
GMFM	< 0.0001	0	−0.0006–0.0006	0.99
GV	0.0001	0.49	−0.0003–0.0005	0.63
PA	0.0002	0.55	−0.0006–0.001	0.58
Velocity of knee flexion
Age	−0.15	−0.03	−9.91–9.62	0.98
GMFM	0.81	0.79	−1.24–2.88	0.43
GV	0.59	1.68	−0.11–1.30	0.09
PA	0.44	0.65	−0.90–1.77	0.52
Toe drag
Age	−1.8	−2.21	−3.42 to −0.18	0.03
GMFM	6.21	0.72	−10.81–23.23	0.47
GV	0.001	1.27	−0.0006–0.003	0.21
PA	0.004	8.7	0.57–0.91	0.007

GMFM = gross motor function measure; GV = gait velocity; PA = popliteal angle.