Subsidence following cervical discectomy and implant-to-bone ratio

Table 2 Relationships between bone surface and implant-to-bone surface area ratio and subsidence, including age as a covariate to control for the confounding variable

Parameter	Subsidence Marginal mean (SE)		B	SE	95% CI for B	t	p
Parameter	No	Yes	B	SE	95% CI for B	t	p
Bone Surface^a	3.93 (0.065)	4.53 (0.147)	0.597	0.161	(0.278-0.197)	3.72	0.0004
Implant-to-bone surface ratio area^b	0.412 (0.0066)	0.361 (0.0149)	- 0.05	0.0164	(-0.084 --0.019)	-3.12	0.0025

Key to abbreviations and symbols:
^aR² for the model 0.189;
^bR² for the model 0.15;
B linear regression coefficient estimate, SE Standard error of the estimate, CI Confidence interval, t t statistics for the linear regression, p two-tailed test probability for t-test statistic;
Underline marks significant associations for p < α = 0.05

ISSN: 1471-2474