From: The reliability of the ankle-brachial index in the Atherosclerosis Risk in Communities (ARIC) study and the NHLBI Family Heart Study (FHS)
Ankle SBP
Arm SBP
Within-person covariance
   Ankle SBP
213.6
88.3
   Arm SBP
116.2
True/total ratio matrix
0.682
0.741
0.736