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Method of Mean Value Calculation as an Additional Source of Variability in Ambulatory Blood Pressure Measurement
- Source :
- American Journal of Hypertension, American Journal of Hypertension, 2010, 23 (7), pp.725-31. ⟨10.1038/ajh.2010.47⟩, American Journal of Hypertension, Oxford University Press (OUP), 2010, 23 (7), pp.725-31. ⟨10.1038/ajh.2010.47⟩, American Journal of Hypertension, Oxford University Press (OUP), 2010, 23 (7), pp.725-31. 〈10.1038/ajh.2010.47〉
- Publication Year :
- 2010
- Publisher :
- Oxford University Press (OUP), 2010.
-
Abstract
- International audience; BACKGROUND: There is no consensus on how the summary mean blood pressure (BP) values should be calculated in ambulatory BP (ABP) monitoring. We report the absence of agreement between two common methods of calculation, either using the arithmetic mean of all valid individual measurements, or the average of hourly means. METHODS: ABP recordings were made with SpaceLabs 90207 monitors. The means of hourly means, as reported by SpaceLabs 92506 software, were compared to arithmetic means calculated independently after raw data extraction. A total of 422 ABP recordings (n = 134 for normotensive subjects and n = 288 for hypertensive patients) were eligible for comparison. Agreement between both methods was assessed according to the Bland-Altman method. RESULTS: Mean 24-h systolic BP (SBP) was significantly lower when calculated by the hourly mean method in both normotensive subjects (-0.9 mm Hg (95% confidence interval (95% CI): -1.0 to -0.8); limits of agreement: -2.2 to +0.4 mm Hg) and hypertensive patients (-1.0 mm Hg (95% CI: -1.2 to -0.9); limits of agreement: -3.7 to +1.6 mm Hg). In hypertensive patients, daytime SBP/diastolic BP was slightly higher with the hourly mean method (0.4 mm Hg (95% CI: +0.3 to +0.5)/+0.4 mm Hg (95% CI: +0.3 to +0.4)) than with the arithmetic mean method. Although small, these differences in daytime BP resulted in misdiagnosis of uncontrolled hypertension in eight (2.8%) recordings. CONCLUSION: Significant differences exist between the mean of hourly means and arithmetic means methods, especially for 24-h BP. For daytime BP, the difference is small, but nevertheless results in the lack of agreement between the two methods used to diagnose uncontrolled hypertension.
- Subjects :
- medicine.medical_specialty
Diastole
MESH : Mathematical Computing
Blood Pressure
030204 cardiovascular system & hematology
MESH : Randomized Controlled Trials as Topic
MESH : Reference Values
MESH: Software
03 medical and health sciences
0302 clinical medicine
[SDV.MHEP.CSC]Life Sciences [q-bio]/Human health and pathology/Cardiology and cardiovascular system
Reference Values
Internal medicine
MESH: Blood Pressure Monitoring, Ambulatory
MESH : Blood Pressure
Internal Medicine
medicine
Humans
MESH: Mathematical Computing
Bland–Altman plot
Mathematical Computing
Randomized Controlled Trials as Topic
MESH: Humans
business.industry
MESH : Humans
Mean value
MESH: Reference Values
MESH: Blood Pressure
Blood Pressure Monitoring, Ambulatory
[ SDV.MHEP.CSC ] Life Sciences [q-bio]/Human health and pathology/Cardiology and cardiovascular system
Confidence interval
[SDV.MHEP.CSC] Life Sciences [q-bio]/Human health and pathology/Cardiology and cardiovascular system
Surgery
MESH: Randomized Controlled Trials as Topic
Mean blood pressure
Blood pressure
Ambulatory
Cardiology
MESH : Blood Pressure Monitoring, Ambulatory
MESH : Software
business
Software
030217 neurology & neurosurgery
Arithmetic mean
Subjects
Details
- ISSN :
- 19417225 and 08957061
- Volume :
- 23
- Database :
- OpenAIRE
- Journal :
- American Journal of Hypertension
- Accession number :
- edsair.doi.dedup.....2c1348924b3b8970ca0646d39576adfc