. Author manuscript; available in PMC: 2014 Jun 1.

Published in final edited form as: Ophthalmology. 2013 Mar 15;120(6):1195–1200. doi: 10.1016/j.ophtha.2012.11.025

Table 5.

Cox multivariate analysis.

Variable	HR	95% CI	Parameter Estimate	SE	χ²	p-value
Number of Failed PKs	1.64	1.18 – 2.28	0.494	0.169	8.59	0.003
Primary KPro	2.23	0.41 – 12.28	0.803	0.870	0.85	0.356
Aphakic KPro	1.14	0.37 – 3.55	0.129	0.580	0.05	0.824
Autoimmune Etiology	11.94	3.31 – 43.11	2.480	0.655	14.34	0.0002
Additional Procedures
Cataract Extraction	2.10	0.64 – 6.89	0.741	0.607	1.49	0.222
Tarsorrhaphy	3.43	1.05 – 11.22	1.232	0.605	4.14	0.042

HR = Hazard Ratio

CI = Confidence Interval

SE = Standard Error

PK = Penetrating Keratoplasty

KPro = Keratoprosthesis