Table 2 Comparisons of WatchBP Office Central with the high-fidelity intra-arterial reference standard (Study 1).

From: Accuracy of the WatchBP Office Central as a Type 2 device for non-invasive estimation of central aortic blood pressure in children and adolescents

 

n

Comparisons

WatchBP

Reference

Difference

95% Confidence Interval

cSBP-WBP vs cSBP-IA

11

25

105.1 ± 10.7

79.0 ± 12.5*

26.1 ± 7.4

23.1–29.1

bSBP-WBP vs cSBP-IA

14

29

92.4 ± 10.6

79.9 ± 11.1*

12.5 ± 6.0

10.2–14.8

bSBP-WBP vs bSBP-Tx

11

11

90.3 ± 12.0

78.7 ± 11.7*

11.6 ± 5.8

7.7–15.6

bDBP-WBP vs cDBP-IA

14

29

49.1 ± 8.1

49.0 ± 10.0

0.1 ± 5.6

−2.1 to 2.2

  1. Data presented as mean ± standard deviation. Pressures are in mmHg. Comparisons refer to the number of individual recordings being compared. There were three fewer participants for the cSBP-WBP comparison, as despite the test device providing an error for cSBP, it reported valid brachial pressures. Adequate tonometry waveforms could not be obtained in three participants.
  2. bDBP/cDBP brachial/central diastolic blood pressure, bSBP/cSBP brachial/central systolic blood pressure, IA intra-arterial (ascending aorta), Tx obtained via the brachial tonometry waveform calibrated to intra-arterial (aortic) mean and diastolic pressures, WBP Watch BP (test device).
  3. *p < 0.001 comparing WatchBP vs the reference method.
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