Table 3.

Clinical results of ACDF compared with Bryan disc using visual analog scale (VAS) and neck disability index (NDI)

	Single level ACDF	Single level Bryan	Double level ACDF	Double level Bryan
VAS
Pre-op	8.3 ± 0.9	8.3 ± 1.0	8.1 ± 1.0	8.8 ± 0.9
Post-op	6.2 ± 0.8	6.4 ± 0.7	5.8 ± 0.8	6.5 ± 0.8
Follow-up	3.8 ± 1.1	3.7 ± 0.9	3.4 ± 1.1	3.3 ± 0.8
p value	0.8371		0.2938
NDI
Pre-op	25.5 ± 1.5	25.3 ± 1.8	26.2 ± 1.9	26.4 ± 1.5
Post-op	16.6 ± 2.0	17.1 ± 1.7	17.6 ± 1.5	16.8 ± 1.8
Follow-up	7.2 ± 1.6	7.6  ± 0.9	8.0 ± 0.9	7.8 ± 1.3
p value	0.2872		0.6753

p = 0.05 set value for statistical significance using the mixed model