TABLE IV.

Tier as Predicted by Different Models Using Change in ASES Score at 2-Year-Range Follow-up^*

	Class†
	A	B	C
Model 1 predicted tier
Probability
p(A)	0.92	0.10	0.05
p(B)	0.06	0.87	0.06
p(C)	0.02	0.03	0.89
Sensitivity	0.84	0.89	0.95
Model 2 predicted tier
Probability
p(A)	0.83	0.10	0.11
p(B)	0.12	0.86	0.17
p(C)	0.05	0.04	0.72
Sensitivity	0.78	0.69	0.92
Model 3 predicted tier
Probability
p(A)	0.69	0.17	0.21
p(B)	0.21	0.64	0.21
p(C)	0.10	0.19	0.58
Sensitivity	0.60	0.59	0.72

^*Model 1 = all baseline variables used, Model 2 = morphological variables omitted, and Model 3 = ASES variables omitted.

^†Classes are separated by pre- to postoperative improvement in ASES total score, where Class A represents an improvement of ≤28 points, Class B represents an improvement of 29 to 55 points, and Class C represents an improvement of >55 points.