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

Published in final edited form as: JACC Cardiovasc Imaging. 2013 May 4;6(6):687–694. doi: 10.1016/j.jcmg.2012.10.024

Table 3.

Adjusted Associations of Collateral Vessel Number and Functional Performance in Participants with Peripheral Artery Disease

	0-3 Collateral Vessels (N=64)	4-7 Collateral Vessels (N=146)	≥8 Collateral Vessels (N=80)	Trend P value
All Study Participants
Six-minute walk (feet)	1,064 (47)	1,165 (28)	1,246 (41)	0.007
Four-meter walking velocity (usual pace) (meters/second)	0.84 (0.02)	0.88 (0.01)	0.91 (0.02)	0.029
Four-meter walking velocity (fastest pace) (meters/second)	1.17 (0.03)	1.22 (0.02)	1.29 (0.03)	0.002
Short Physical Performance Battery	9.21 (0.33)	9.80 (0.19)	10.11 (0.27)	0.059
Participants without Superficial Femoral Artery Occlusion
	0-3 Collateral Vessels (N=62)	4-7 Collateral Vessels (N=127)	≥8 Collateral Vessels (N=61)
Six-minute walk (feet)	1,046 (46)	1,193 (30)	1,249 (45)	0.003
Four-meter walking velocity (usual pace) (meters/second)	0.83 (0.02)	0.88 (0.01)	0.90 (0.02)	0.033
Four-meter walking velocity (rapid pace) (meters/second)	1.15 (0.04)	1.24 (0.02)	1.27 (0.03)	0.010
Short Physical Performance Battery (0-12 scale, 12=best)	9.17 (0.33)	9.84 (0.21)	10.03 (0.32)	0.064

*Mean values (standard error) are shown after statistical adjustment. Model adjusts for age, sex, race, comorbidities, smoking, ankle brachial index, and BMI.