Table 3.

Predictive ability of each independent predictor and the combination model for quadriceps strength recovery

	Predictor	Accuracy	Sensitivity	Specificity	PPV	NPV	Cut-off value
A	Age	0.64	0.72	0.50	0.72	0.50	22.5 years
B	Sex	0.53	0.53	0.54	0.67	0.39	–
C	Body mass index	0.63	0.82	0.30	0.68	0.49	24.3 kg/m2
D	Preinjury sport level	0.60	0.59	0.61	0.73	0.45	–
E	LSI of quadriceps strength	0.65	0.67	0.62	0.76	0.51	63.3%
F	The combination model	0.67	0.61	0.76	0.82	0.53	–

PPV positive predictive value, NPV negative predictive value, LSI limb symmetry index