Comparison of the operative time for open door laminoplasty using titanium plate spacers or hydroxyapatite block spacers: a retrospective study

Table 3 Multiple regression analysis of the primary outcome

Adjusted variables	Coefficient	95% confidence interval	p value
Using TP spacers	− 30	− 42 to − 17	< 0.001
Using HA spacers	reference
Age	0.05	− 0.63–0.73	0.89
Sex (male)	11	− 3.7–25	0.14
OPLL	3.4	− 10–17	0.63
Number of DL	16	6.1–26	0.002
Laminoplasty of dens	18	4.0–32	0.01

Abbreviations: TP titanium plate, HA hydroxyapatite block, OPLL ossification of posterior longitudinal ligament, DL decompressed lamina

ISSN: 1749-799X