Table 4.

Using multivariate logistic regression analysis to judge independent risk factors for augmented screws with extensive epidural cement leakage

	Regression coefficients (B)	OR	95% confidence interval of OR		P values
	Regression coefficients (B)	OR	Lower bound	Upper bound	P values
The type of basivertebral foramen (magistral/dispersed)	2.154	8.616	3.438	21.591	< 0.001
The distance between screw tip and the midline of vertebral body(mm)^a	− 0.269	0.764	0.639	0.913	0.003
The distance between screw tip and the posterior wall of the vertebral body (mm)^a	− 0.264	0.768	0.692	0.852	< 0.001
Volume of cement injected (ml)^a	0.452	1.572	1.043	2.370	0.031

OR odd ratio

^aQuantitative variables are expressed as mean ± SD