Segmental motion at the peak of the ossification foci is independent risk factor except for mal-alignment and thick ossification foci for poor outcome after laminoplasty for cervical ossification of the posterior longitudinal ligament: analyses in patients with positive K-line, lordotic alignment, and lower canal occupying ratio

Table 3 Univariate analysis and stepwise logistic regression

	p value
Univariate analysis
Age	0.24
Sex	0.21
Follow-up period	0.36
Pre-op. JOA score	0.24
Type of OPLL	0.68
Maximum occupation ratio	0.09^#
Pre-op. C2-7 angle	0.29
Pre-op. segmental ROM at peak of OPLL	0.03^#
Stepwise logistic regression
Pre-op. segmental ROM at peak of OPLL	0.04*
Maximum occupation ratio	0.07

JOA Japanese Orthopedic Association, OPLL ossification of the posterior longitudinal ligament, ROM range of motion
^#p < 0.1
*p < 0.05

ISSN: 1749-799X