. Author manuscript; available in PMC: 2009 Dec 1.

Published in final edited form as: J Vasc Surg. 2008 Dec;48(6):1464–1471. doi: 10.1016/j.jvs.2008.07.062

Table 3.

Multivariable model for the prediction of amputation-free survival with an integer risk score assigned to each covariate (PIII derivation set).

COVARIATES	β coefficient	Integer score	HR (95% CI)	P-Value
Dialysis	1.03	4	2.81 (1.97, 3.99)	<0.0001
CLI criterion	0.80	3	2.22 (1.43, 3.44)	0.0004
Age ≥ 75 years	0.50	2	1.64 (1.21–2.22)	0.001
Hematocrit < 30	0.48	2	1.61 (1.11, 2.34)	0.012
History of advanced CAD	0.34	1	1.41 (1.05, 1.88)	0.021