Table 2.

Cephalad adjacent segment degeneration–CBT Group VS. PS Group

Variable		Pre-operative	6 months FU		Last FU
		mean ± SD	mean ± SD	p Value	mean ± SD	p Value
CBT Group N = 74	ISH (mm)	11.52 ± 2.37	11.44 ± 1.94	0.53	11.20 ± 1.82	0.00
	FH (mm)	20.85 ± 2.95	20.41 ± 2.57	0.24	20.16 ± 2.43	0.00
	FW (mm)	11.88 ± 2.73	11.91 ± 2.67	0.86	11.40 ± 2.58	0.02
	ROM (°)	11.63 ± 1.92	11.99 ± 1.62	0.15	12.52 ± 2.01	0.03
PS Group N = 114	ISH (mm)	12.08 ± 1.58	11.15 ± 1.79	0.00	10.60 ± 1.92	0.00
	FH (mm)	20.56 ± 4.17	19.35 ± 2.82	0.00	18.40 ± 2.81	0.00
	FW (mm)	12.42 ± 2.12	11.26 ± 1.69	0.00	10.11 ± 2.00	0.00
	ROM (°)	12.05 ± 2.21	12.93 ± 1.90	0.00	14.75 ± 1.53	0.00