Table 2. Comparison of clinical outcomes between the 2 groups.

	Discover Group	Zero-P Group	P
JOA
Preop	9.12±1.37	9.26±1.29	0.760
Postop 3-mo	14.33±1.30*	14.37±1.48*	0.864
Final FU	14.28±1.39*	14.24±1.26*	0.980
NDI
Preop	20.03±2.80	19.90±2.09	0.633
Postop 3-mo	5.93±1.41*	6.00±1.36*	0.926
Final FU	5.77±1.24*	5.66±1.30*	0.638

JOA, Japanese Orthopaedic Association; NDI, Neck Disability Index; Preop, Preoperatively; Postop, Postoperative; FU, follow-up.

* P <0.05 compared with preoperative value.