Reproducibility of ambulatory blood pressure measures in African-American adolescents

Vernon A. Barnes, Maribeth H Johnson, J. Caroline Dekkers, Frank A. Treiber

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Objective: The primary purpose of this study was to evaluate the reproducibility of ambulatory blood pressure (BP) measures in African-American (AA) adolescents. Methods: Forty-one AA adolescents (age 16.6 ± 1.3 yrs, 16F) with high-normal BP were measured on 3 occasions at 2-month intervals. Systolic BP (SBP), diastolic BP (DBP), and heart rate (HR) measures were recorded using the Spacelabs ambulatory BP monitor 90207 (Redmond, Wash) in the natural environment over 24-hour periods. Mixed model repeated measures ANOVAs were used to analyze the underlying error variance-covariance (V-C) structures as well as mean differences for the 3 visits. Results: Daytime measures: there were no significant mean differences across visits for daytime SBP, DBP, and HR (all Ps>.57). The error V-C matrix was heterogeneous Toeplitz for daytime SBP. Correlations between visits 1 and 2, 1 and 3, and 2 and 3 for daytime SBP were rs=0.71, 0.47, and 0.71, respectively. Compound symmetry (CS) was the preferred model for daytime DBP (r=0.68) and HR (r=0.75). Nighttime measures: there were no significant mean differences across visits for nighttime SBP, DBP, and HR (all Ps>.29). The error V-C matrix was unstructured for nighttime SBP. Correlations between visits 1 and 2, 1 and 3, and 2 and 3 for SBP were rs=0.74, 0.33, and 0.33, respectively. CS was preferred for night-time DBP (r=0.58) and HR (r=0.74). Conclusion: Collectively, these findings demonstrate that 3 measurements of ambulatory-derived DBP and HR measures are stable across 4 months, but SBP was only stable across 2 months in African-American adolescents.

Original languageEnglish (US)
JournalEthnicity and Disease
Volume12
Issue number4
StatePublished - Sep 1 2002

Fingerprint

African Americans
Heart Rate
Blood Pressure
Blood Pressure Monitors
Analysis of Variance
Hypertension

Keywords

  • Adolescent
  • African American
  • Ambulatory
  • Blood pressure

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Medicine(all)

Cite this

Reproducibility of ambulatory blood pressure measures in African-American adolescents. / Barnes, Vernon A.; Johnson, Maribeth H; Dekkers, J. Caroline; Treiber, Frank A.

In: Ethnicity and Disease, Vol. 12, No. 4, 01.09.2002.

Research output: Contribution to journalArticle

Barnes, Vernon A. ; Johnson, Maribeth H ; Dekkers, J. Caroline ; Treiber, Frank A. / Reproducibility of ambulatory blood pressure measures in African-American adolescents. In: Ethnicity and Disease. 2002 ; Vol. 12, No. 4.
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AB - Objective: The primary purpose of this study was to evaluate the reproducibility of ambulatory blood pressure (BP) measures in African-American (AA) adolescents. Methods: Forty-one AA adolescents (age 16.6 ± 1.3 yrs, 16F) with high-normal BP were measured on 3 occasions at 2-month intervals. Systolic BP (SBP), diastolic BP (DBP), and heart rate (HR) measures were recorded using the Spacelabs ambulatory BP monitor 90207 (Redmond, Wash) in the natural environment over 24-hour periods. Mixed model repeated measures ANOVAs were used to analyze the underlying error variance-covariance (V-C) structures as well as mean differences for the 3 visits. Results: Daytime measures: there were no significant mean differences across visits for daytime SBP, DBP, and HR (all Ps>.57). The error V-C matrix was heterogeneous Toeplitz for daytime SBP. Correlations between visits 1 and 2, 1 and 3, and 2 and 3 for daytime SBP were rs=0.71, 0.47, and 0.71, respectively. Compound symmetry (CS) was the preferred model for daytime DBP (r=0.68) and HR (r=0.75). Nighttime measures: there were no significant mean differences across visits for nighttime SBP, DBP, and HR (all Ps>.29). The error V-C matrix was unstructured for nighttime SBP. Correlations between visits 1 and 2, 1 and 3, and 2 and 3 for SBP were rs=0.74, 0.33, and 0.33, respectively. CS was preferred for night-time DBP (r=0.58) and HR (r=0.74). Conclusion: Collectively, these findings demonstrate that 3 measurements of ambulatory-derived DBP and HR measures are stable across 4 months, but SBP was only stable across 2 months in African-American adolescents.

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