Table 4.

Comparison of C-statistics for each independent predictor and the combination model for quadriceps strength recovery

	Predictor	AUC	vs. B	vs. C	vs. D	vs. E	vs. F
A	Age	0.63 (0.58–0.67)	0.005	0.013	n.s	n.s	< 0.001
B	Sex	0.53 (0.49–0.58)	–	n.s	0.016	< 0.001	< 0.001
C	Body mass index	0.56 (0.51–0.61)	–	–	n.s	< 0.001	< 0.001
D	Preinjury sport level	0.61 (0.57–0.65)	–	–	–	0.029	< 0.001
E	LSI of quadriceps strength	0.68 (0.63–0.72)	–	–	–	–	0.002
F	The combination model	0.73 (0.69–0.77)	–	–	–	–	–

The combination model consisted of age, sex, body mass index, preinjury sport level, and LSI of quadriceps strength

AUC area under the curve, LSI limb symmetry index