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Table 4 Multivariate between-visit covariance matrices for ankle and arm systolic blood pressures estimated in reliability study subjects

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 88.3 116.2
True/total ratio matrix   
   Ankle SBP 0.682 0.741
   Arm SBP 0.741 0.736