Table 1.

Patient demographic data in single-level ACDF

Variables	Group A (n = 51)	Group B (n = 58)	P value
Age (year)	48.1 ± 7.2	48.7 ± 8.5	0.73
Male gender	21/30	29/29	0.36
Hypertension	8/51	7/58	0.58
Diabetes	4/51	6/58	0.91
Smoker	11/51	9/58	0.45
Follow-up (month)	36.7 ± 11.3	34.8 ± 6.2	0.27
Segements			0.10
C3/C4	8	3
C4/C5	9	13
C5/C6	18	30
C6/C7	16	12
Kellgren Grading Standards			0.74
0	4	3
1	4	8
2	12	15
3	23	21
4	8	11
Operative time (min)	79.5 ± 20.6	74.7 ± 18.5	0.20
Blood loss (ml)	62.4 ± 36.9	56.8 ± 31.5	0.40
Complications	1/51	1/58	1.00
Neck VAS (point)
Preoperative	5.4 ± 2.2	4.9 ± 1.8	0.20
Postoperative	3.1 ± 1.9*	2.7 ± 2.0*	0.29
1 year follow-up	2.3 ± 1.4*	2.1 ± 1.3*	0.44
Final follow-up	1.5 ± 0.8*	1.6 ± 1.0*	0.57
Arm VAS (point)
Preoperative	5.9 ± 2.1	6.2 ± 2.0	0.45
Postoperative	3.4 ± 1.8*	3.2 ± 1.6*	0.54
1 year follow-up	2.0 ± 1.1*	2.2 ± 1.4*	0.41
Final follow-up	1.7 ± 1.0*	1.5 ± 0.8*	0.25
NDI
Preoperative	31.2 ± 13.8	29.8 ± 11.4	0.56
6 months follow-up	17.8 ± 12.4*	15.7 ± 11.2*	0.36
Final follow-up	10.3 ± 6.1*	9.7 ± 7.3*	0.65

VAS 10-point visual analog scale, NDI Neck Disability Index

* Compared with preoperative (P < 0.05)