Table 4.

Segmental (A) and cervical lordosis (B)

A) Segmental Lordosis (plain [°] mean ± SEM)
Variable	TTN (n = 44)	PEEK (n = 42)	p-value
Operated Segment [°]
Pre-OP	2.71 ± 4.68	4.43 ± 3.37	0.054
Post-OP	5.49 ± 3.85**	6.48 ± 3.67**	0.223
Final	4.06 ± 3.65**	5.51 ± 4.13**	0.075
B) Cervical Lordosis (plain [°] mean ± SEM)
Variable	TTN (n = 44)	PEEK (n = 42)	p-value
C2-7 [°]
Pre-OP	10.750 ± 14.44	16.31 ± 11.18	0.050
Post-OP	14.034 ± 12.44*	17.64 ± 9.96*	0.143
Final	13.140 ± 12.71	13.29 ± 7.06	0.288

4A: **significant differences (p < 0.031) comparing pre-OP with post-OP (=correction) as well as post-OP with final within the groups (=loss of correction).

4B: *significant differences (p < 0.048) comparing pre-OP with post-OP (=correction) within the groups.