Table 2. Analysis of risk factors for development of failure.

	Univariate		p	Multivariate		p
	OR	95% CI		OR	95% CI
Age	1.173	1.073-1.282	<0.001
Sex	0.945	0.299-2.990	0.924
MCR >0.09	7	1.841-26.613	0.004	7.653	1.685-34.753	0.008
Age >73 (year)	0.143	0.043-0.479	0.002	0.135	0.037-0.492	0.002
OR: Odds ratio; CI: Confidence interval; MCR: Medial cortical ratio.