Table 3.

Results from multiple linear regression of baseline variables on change in functional outcome at minimum 1 year

Functional outcome	Covariate	Estimate (95% confidence interval)	P value
BP	Multilevel disease	−13.6 (−16.5, −10.8)	0.018
PCS	Age at surgery (years)	−0.2 (−0.25, −0.15)	0.027
	Multilevel disease	−6.9 (−8.3, −5.5)	0.015
ODI	Fusion	−10.1 (−12.5, −7.7)	0.039

BP change in the bodily pain index from the SF-36, ODI Oswestry disability index change, PCS physical component summary score change of the SF-36