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Table 5 Multivariate within-visit covariance matrices for ankle and arm systolic blood pressures estimated in ARIC study participants

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 49.8 -0.0159
   Arm SBP -0.0159 44.0
True/total ratio matrix   
   Ankle SBP 0.922 1.000
   Arm SBP 1.000 0.900