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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