Skip to main content

Table 2 Variation in DINAMAPâ„¢ measurements of arm and ankle systolic blood pressure and the ankle-brachial index

From: The reliability of the ankle-brachial index in the Atherosclerosis Risk in Communities (ARIC) study and the NHLBI Family Heart Study (FHS)

Estimate

Ankle SBP

Arm SBP

ABI

Mean (SD) of pair means, mmHg*

146.2 (23.76)

125.2 (19.57)

1.178 (0.1522)

Mean (SD) of pair differences, mmHg*

-3.1 (20.67)

0.9 (15.24)

-0.031 (0.1494)‡

Square root of variance components, mmHg*

   

   Between-person†

21.4 (17.6,25.1)

18.0 (14.5, 1.3)

0.133 (0.112,0.150)

   Within-person†

14.6 (12.7,16.5)

10.8 (8.9,12.4)

0.106 (0.091,0.121)

   Total†

25.9 (22.8,28.7)

21.0 (18.3, 3.7)

0.170 (0.151,0.185)

Reliability coefficient†

0.682 (0.570, 0.772)

0.736 (0.622, 0.827)

0.612 (0.505, 0.699)

Within-person coefficient of variation, %†

10.0 (8.6, 11.2)

8.6 (7.1, 9.9)

9.0 (7.7, 10.2)

Pearson correlation coefficient

0.68

0.74

0.62

  1. *Systolic blood pressures (SBPs) in mmHg; the ankle-brachial index (ABI) is without units.
  2. Difference represents first minus second measure.
  3. †Estimate (95% confidence interval).
  4. ‡ p < .05 for t-test of zero mean. Adjustment for the fixed effect of time changed very little the estimates of variance components.