Table 7.

Outcome score and their relationship other variables

Outcome variable	Independent variable	Univariate statistics		Multivariate statistics using multiple linear regressiona
		Student’s t test/Pearson’s correlation	p value	β	t	p value
Nurick’s score at last follow-up	OPLL	t = −2.17; df = 22.08	0.037	−0.160	−1.632	0.106
	Nurick’s score preoperative	0.236	0.018	0.242	2.438	0.017
	Corpectomy involving only one or two levels	t = 2.218; df = 41.31	0.033	0.159	1.624	0.108
	JOA score at last follow-up	−0.697	<0.001	−0.703	−9.698	<0.001
	Improvement reported by patientb	−0.546	<0.001	−0.533	−5.901	<0.001
	Duration of symptoms >12 months	0.125	0.214	0.185	1.783	0.08
JOA score at last follow-up	OPLL	t = 1.096; df = 98	0.276	0.162	1.672	0.098
	JOA preoperative score	0.358	<0.001	0.344	3.480	0.001
	Corpectomy involving only one or two levels	t = −1.91; df = 98	0.059	−0.179	−1.857	0.067
	Nurick’s score at last follow up	−0.697	<0.001	−0.667	−9.714	<0.001
	Improvement reported by patientb	0.484	<0.001	0.457	4.757	<0.001
	Duration of symptoms	−0.077	0.451	−0.084	−0.816	0.417

^aJOA; adjusted for age, gender and respective preoperative score

^bImprovement reported by patient