Table 1.

Characteristics of the study population (n = 94).

Characteristics	Value
Age, year, mean (range)	50 (31–65)
Gender: female, n (%)	67 (71.3%)
Type of implant:
PEEK, n (%)	85 (54.1%)
TC-PEEK, n (%)	72 (45.9%)
Type of spinal fusion:
Single-level, n (%)	31 (33%)
Double-level, n (%)	63 (67%)
C3/C4, n	2 (2.3%)
C4/C5, n	0 (0%)
C5/C6, n	27 (28.9%)
C6/C7, n	2 (2.3%)
C3–C5, n	4 (4.5%)
C4–C6, n	15 (16.1%)
C5–C7, n	43 (45.9%)
VAS, pts, mean:
Preoperative	5.9
1 month after the surgery	2.4
6 months after the surgery	2.2
12 months after the surgery	2.2
∆VAS	3.6
NDI, pts, mean:
Preoperative	24
1 month after the surgery	14
6 months after the surgery	11
12 months after the surgery	10
∆NDI	14