Table 6.

Associations between the ankle brachial index (ABI) and magnetic resonance imaging velocity parameters.

	Independent Variable	N	BETA	SE	R2	Adjusted R2	P-value
Pooled Analysis
ABI	Proximal SFA average velocity, cm/s	53	0.005	0.002	0.156	0.139	0.004
	Proximal SFA maximum velocity, cm/s	53	0.003	0.001	0.152	0.135	0.004
	Proximal SFA minimum velocity, cm/s	53	0	0.004	0	−0.019	0.90
	Distal SFA average velocity, cm/s	52	0.003	0.002	0.044	0.025	0.13
	Distal SFA maximum velocity, cm/s	52	0.002	0.001	0.052	0.033	0.10
	Distal SFA minimum velocity, cm/s	52	−0.003	0.005	0.007	−0.013	0.56
	Delta SFA average velocity, cm/s	52	0.009	0.003	0.133	0.116	0.008
	Delta SFA maximum velocity, cm/s	52	0.005	0.002	0.132	0.114	0.008
	Delta SFA minimum velocity, cm/s	52	0.004	0.005	0.01	−0.01	0.49
Diabetic PAD Patients
ABI	Proximal SFA average velocity, cm/s	22	0.006	0.003	0.155	0.112	0.07
	Proximal SFA maximum velocity, cm/s	22	0.003	0.001	0.168	0.126	0.06
	Proximal SFA minimum velocity, cm/s	22	−0.005	0.009	0.013	−0.037	0.61
	Distal SFA average velocity, cm/s	22	0.002	0.003	0.028	−0.021	0.46
	Distal SFA maximum velocity, cm/s	22	0.002	0.001	0.048	0.001	0.32
	Distal SFA minimum velocity, cm/s	22	−0.01	0.008	0.072	0.025	0.23
	Delta SFA average velocity, cm/s	22	0.007	0.004	0.106	0.061	0.14
	Delta SFA maximum velocity, cm/s	22	0.003	0.002	0.09	0.044	0.18
	Delta SFA minimum velocity, cm/s	22	0.039	0.018	0.183	0.142	0.047
Non-Diabetic PAD Patients
ABI	Proximal SFA average velocity, cm/s	31	0.007	0.002	0.227	0.201	0.007
	Proximal SFA maximum velocity, cm/s	31	0.003	0.001	0.230	0.203	0.006
	Proximal SFA minimum velocity, cm/s	31	0.001	0.005	0.001	−0.034	0.89
	Distal SFA average velocity, cm/s	30	0.008	0.003	0.189	0.160	0.016
	Distal SFA maximum velocity, cm/s	30	0.004	0.002	0.183	0.154	0.018
	Distal SFA minimum velocity, cm/s	30	0.002	0.007	0.004	−0.032	0.76
	Delta SFA average velocity, cm/s	30	0.011	0.005	0.141	0.111	0.041
	Delta SFA maximum velocity, cm/s	30	0.006	0.003	0.161	0.131	0.028
	Delta SFA minimum velocity, cm/s	30	0.000	0.005	0.000	−0.036	0.96

BETA: parameters estimate; SE: standard error; PAD: peripheral artery disease; SFA: superficial femoral artery; ABI: ankle brachial index. Delta refers to the velocity difference between the distal and proximal SFA locations.