TABLE 4.

Multivariate analysis of factors associated with development of RF after accounting for clustering by study site

Parameter	Adjusted HR (95% CI)	p Value
3-mo postop PT	1.895 (1.196–3.002)	0.0065 *
EBL	1.02 (1.005–1.036)	0.0088 †
3-mo postop PI-LL	0.728 (0.529–1.002)	0.0515*
Diabetes, yes vs no	2.656 (0.935–7.542)	0.0667
rhBMP-2 used, yes vs no	0.476 (0.205–1.102)	0.0515
Age	0.76 (0.533–1.083)	0.1284‡
Preop global coronal alignment	0.921 (0.813–1.044)	0.2005*¶

Boldface type indicates statistical significance.

^*Modeled per 10° increase.

^†Modeled per 100-ml increase.

^‡Modeled per decade increase.

^¶Absolute value.