Table 5.

Logistic regression analysis for the risk factors of postoperative C5 palsy

Variables	Univariate		Multivariate#
	RR (95% CI)	p Value	RR (95% CI)	p Value
Age	1.44 (0.63-3.30)	0.39
Sex	1.50 (0.79-7.69)	0.63
Diagnosis	0.87 (0.36-7.14)	0.77	0.27 (0.02-3.14)	0.30
Duration of disease	5.05 (0.99-25.88)	0.05
No. of surgical levels	0.97 (0.44-2.17)	0.95
Preoperative JOA score	3.90 (1.11-13.66)	0.03	0.86 (0.09-8.12)	0.89
Cervical curvature correction	0.26 (0.08-0.71)	0.008	0.15 (0.02-0.97)	0.047*
Occupying rate of spinal canal at C4/5	0.75 (0.28-2.06)	0.18	0.26 (0.02-3.30)	0.299
Diameter of the C4/5 foramen	0.13 (0.01-0.76)	0.02	0.03 (0.001-0.76)	0.034*
Vertebral trough width	0.16 (0.03-0.79)	0.03	0.04 (0.001-0.81)	0.037*
Preoperative HIZ in T2 Weighted MRI at C4/5	1.41 (0.32-6.09)	0.65
Intervertebral height variation	0.17 (0.03-0.86)	0.17	0.03 (0.001-0.57)	0.02*

^#The multivariate model includes variables with P<0.20 by univariate analysis.

^*Statistically significant.