Table 4.

1) Correlation coefficients of control, injured and OA groups between self-reported outcomes and biomechanical parameters; 2) correlation coefficients of K-L grade with self-reported outcomes and biomechanical parameters using a sub-set of the OA group.

F rank	Variable	Spearman rank correlation
		1)					2)
		Pain	Symptom	ADL	QOL	S/R	K-L grade
1	Maximum external hip abduction moment (Nm/weight ∗ height)	− 0.23 ⁎⁎	− 0.24 ⁎⁎	− 0.27 ⁎⁎	− 0.22 ⁎⁎	− 0.27 ⁎⁎	0.62⁎⁎
2	S/R	0.89 ⁎⁎	0.81 ⁎⁎	0.87 ⁎⁎	0.87 ⁎⁎	–	0.21
3	First peak external knee adduction moment (Nm/weight ∗ height)	0.37 ⁎⁎	0.37 ⁎⁎	0.36 ⁎⁎	0.47 ⁎⁎	0.40 ⁎⁎	− 0.10
4	Second peak external knee adduction moment (Nm/weight ∗ height)	0.43 ⁎⁎	0.43 ⁎⁎	0.44 ⁎⁎	0.55 ⁎⁎	0.46 ⁎⁎	0.29
5	Symptom	0.81 ⁎⁎	–	0.80 ⁎⁎	0.79 ⁎⁎	0.81 ⁎⁎	− 0.27
6	Maximum vertical loading rate (Nm/s/weight ∗ height)	0.22 ⁎⁎	0.17 ⁎	0.24 ⁎⁎	0.18 ⁎	0.22 ⁎⁎	0.14
7	First peak external hip adduction moment (Nm/weight ∗ height)	0.02	0.01	− 0.04	0.10	0.02	0.47⁎
8	Maximum external knee abduction moment (Nm/weight ∗ height)	− 0.23 ⁎⁎	− 0.24 ⁎⁎	− 0.22 ⁎⁎	− 0.28 ⁎⁎	− 0.26 ⁎⁎	0.62⁎⁎
9	QOL	0.89 ⁎⁎	0.79 ⁎⁎	0.80 ⁎⁎	–	0.87 ⁎⁎	0.21
10	Second peak external hip adduction moment (Nm/weight ∗ height)	− 0.01	− 0.02	− 0.01	0.7	− 0.01	0.38
11	ADL	0.89 ⁎⁎	0.80 ⁎⁎	–	0.80 ⁎⁎	0.87 ⁎⁎	0.00
12	Pain	–	0.81 ⁎⁎	0.89 ⁎⁎	0.85 ⁎⁎	0.89 ⁎⁎	0.01

F rank = variable importance based on minimum-redundancy maximum-relevancy feature selection; Spearman rank = ≤ 0.39 (weak), 0.40–0.59 (modest), 0.60–0.79 (strong), ≥ 0.8 (very strong).

^⁎P = < 0.05.

^⁎⁎P = < 0.001.