TABLE I.

Healthy vs. Pre-OA Classification Performance

Movement Type	Healthy Mean ± S.D.	Arthritic Mean ± S.D.	P value	Effect Size (Hedge’s g)	CI 95%	ROC AUC	Accuracy	Sensitivity	Specificity
Flexion-Extension	0.38 ± 0.19	0.61 ± 0.16	<0.005	1.18	[0.09 0.37]	0.82	76%	82%	72%
Sit-to-Stand	0.29 ± 0.27	0.74 ± 0.17	<0.005	1.73	[0.25 0.64]	0.90	88%	100%	81%
Walking	0.41 ± 0.15	0.59 ± 0.12	<0.005	1.16	[0.07 0.29]	0.81	80%	80%	80%
Composite	0.30 ± 0.20	0.81 ± 0.15	<0.005	2.46	[0.37 0.65]	0.96	94%	100%	90%
Age / BMI	0.36 ± 0.20	0.65 ± 0.25	0.006	1.26	[0.05 0.43]	0.78	83%	82%	85%