Table 6

Results of the between-groups post-hoc comparisons of the change in disability outcomes after controlling for baseline scores in a multivariable mixed-effects regression model.

Comparison		Estimated Difference^{^a}	95% CI		P
Comparison		Estimated Difference^{^a}	Lower	Upper	P
Change in ODI^{^b}
3 mo	6 mo	6.46	5.72	7.21	<0.001^{^c}
6 mo	12 mo	0.90	0.12	1.67	0.07
3 mo	12 mo	7.36	6.60	8.12	<0.001^{^c}
<40 y	40–65 y	2.88	1.12	4.63	0.004^{^c}
40–65 y	>65 y	0.37	−2.55	3.29	>0.99
<40 y	>65 y	3.25	0.05	6.44	0.14
Brantigan	STALIF	0.11	−1.67	1.88	>0.99
STALIF	Australis	1.86	0.04	3.68	0.14
Brantigan	Australis	1.97	0.22	3.72	0.08
Higher ALIF	Lower ALIF	5.74	2.01	9.46	0.003^{^c}
Change in RMDQ^{^a}
3 mo	6 mo	2.37	2.10	2.64	<0.001^{^c}
6 mo	12 mo	0.49	0.21	0.77	0.002^{^c}
3 mo	12 mo	2.86	2.58	3.14	<0.001^{^c}
<40 y	40–65 y	0.80	0.19	1.42	0.030^{^c}
40–65 y	>65 y	0.42	−0.60	1.44	>0.99
<40 y	>65 y	1.22	0.11	2.34	0.10
Brantigan	STALIF	0.15	−0.47	0.77	>0.99
STALIF	Australis	0.93	0.29	1.56	0.013^{^c}
Brantigan	Australis	1.08	0.47	1.69	0.002^{^c}
Higher ALIF	Lower ALIF	2.61	1.32	3.91	<0.001^{^c}

Abbreviations: ALIF, anterior lumbar interbody fusion; ODI, Oswestry Disability Index; RMDQ, Roland-Morris Disability Questionnaire.
↵a The estimated difference is the more significant improvement experienced by the category in bold text for each pairwise comparison. None of the estimated differences between groups were clinically significant.
↵b The estimated mean improvement at 3 months postsurgery for a <40-year-old patient with mean baseline, Brantigan cage, and higher ALIF were 25.5 for ODI and 9.8 for RMDQ.
↵c Statistically significant difference P < 0.05.