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. Author manuscript; available in PMC: 2014 Aug 6.
Published in final edited form as: J Am Coll Cardiol. 2013 May 22;62(6):553–559. doi: 10.1016/j.jacc.2013.04.061

Table 5.

C-index for peripheral arterial disease status classified using the traditional and alternative ankle-brachial index methods

All-cause mortality C-index (95%
CI)		 P-value P-value
for
difference
Traditional-PAD 0.570 (0.534-
0.606)		 < 0.001 0.150
Alternative-PAD 0.596 (0.555-
0.636)		 < 0.001
Cardiovascular
mortality		 C-index (95%
CI)		 P-value P-value
for
difference
Traditional-PAD 0.575 (0.508-
0.641)		 < 0.001 0.013
Alternative-PAD 0.665 (0.595-
0.734)		 < 0.001

ABI, ankle -brachial index, CI, confidence interval; PAD, peripheral arterial disease

PAD indicates an ABI < 0.9 by the stated method