Evidence map›Paper›PMID 28475667›Full record

Observational studyAmerican journal of hypertension2017

Interarm Difference in Systolic Blood Pressure in Different Ethnic Groups and Relationship to the "White Coat Effect": A Cross-Sectional Study.

Claire Lorraine Schwartz, Christopher Clark, Constantinos Koshiaris, Paramjit S Gill, Shelia M Greenfield, Sayeed M Haque, Gurdip Heer, Amanpreet Johal, Ramandeep Kaur, Jonathan Mant and 4 more

Open access · bronzeAbstract readComparative StudyObservational Study
In one paragraph

Observational study in American journal of hypertension, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed
1.2field-weighted citation impact, top 19% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

10 citing papers in PubMed, 18 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Article
  6. Systolic inter-arm blood pressure difference and risk of cognitive decline in older people: a cohort study.The British journal of general practice : the journal of the Royal College of General Practitioners · 2020
    Article
  7. Blood pressure cutoffs for white-coat and masked effects in a large population undergoing home blood pressure monitoring.Hypertension research : official journal of the Japanese Society of Hypertension · 2019
    Article
  8. Association of thyroid function with white coat hypertension and sustained hypertension.Journal of clinical hypertension (Greenwich, Conn.) · 2019
    Observational
  9. Article
  10. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

14 authors at 5 institutions in 1 country.

Claire Lorraine SchwartzNuffield Department of Primary Care Health Sciences, NIHR School for Primary Care Research, University of Oxford, Radcliffe Observatory Quarter, Oxford, UK.
Christopher ClarkPrimary Care Research Group, University of Exeter Medical School, Smeall Building, St Luke's Campus, Exeter, UK.
Constantinos KoshiarisNuffield Department of Primary Care Health Sciences, NIHR School for Primary Care Research, University of Oxford, Radcliffe Observatory Quarter, Oxford, UK.
Paramjit S GillWMS-Social Science and Systems in Health, University of Warwick, Coventry, Birmingham, UK.
Shelia M GreenfieldInstitute of Applied Health Research, University of Birmingham, Edgbaston, Birmingham, UK.
Sayeed M HaqueInstitute of Clinical Science, University of Birmingham, Edgbaston, Birmingham, UK.
Gurdip HeerInstitute of Clinical Science, University of Birmingham, Edgbaston, Birmingham, UK.
Amanpreet JohalNIHR Clinical Research Network: West Midlands, Division of Health Sciences, Warwick Medical School, University of Warwick, Coventry, UK.
Ramandeep KaurInstitute of Clinical Science, University of Birmingham, Edgbaston, Birmingham, UK.
Jonathan MantPrimary Care Unit, Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Wort's Causeway, Cambridge, Cambridgeshire, UK.
Una MartinInstitute of Clinical Science, University of Birmingham, Edgbaston, Birmingham, UK.
Mohamed A MohammedSchool of Health Studies, University of Bradford, Bradford, UK.
Sally WoodNuffield Department of Primary Care Health Sciences, NIHR School for Primary Care Research, University of Oxford, Radcliffe Observatory Quarter, Oxford, UK.
Richard J McManusNuffield Department of Primary Care Health Sciences, NIHR School for Primary Care Research, University of Oxford, Radcliffe Observatory Quarter, Oxford, UK.
University of Birmingham · GBUniversity of Oxford · GBUniversity of Warwick · GBUniversity of Cambridge · GBUniversity of Exeter · GB

Funding

Department of Health NIHR-RP-02-12-015Department of Health PB-PG-1207-15042Department of Health RP-PG-0614-20005
6 · The paper itself

Abstract

backgroundInterarm differences (IADs) ≥10 mm Hg in systolic blood pressure (BP) are associated with greater incidence of cardiovascular disease. The effect of ethnicity and the white coat effect (WCE) on significant systolic IADs (ssIADs) are not well understood.

methodsDifferences in BP by ethnicity for different methods of BP measurement were examined in 770 people (300 White British, 241 South Asian, 229 African-Caribbean). Repeated clinic measurements were obtained simultaneously in the right and left arm using 2 BPTru monitors and comparisons made between the first reading, mean of second and third and mean of second to sixth readings for patients with, and without known hypertension. All patients had ambulatory BP monitoring (ABPM). WCE was defined as systolic clinic BP ≥10 mm Hg higher than daytime ABPM.

resultsNo significant differences were seen in the prevalence of ssIAD between ethnicities whichever combinations of BP measurement were used and regardless of hypertensive status. ssIADs fell between the 1st measurement (161, 22%), 2nd/3rd (113, 16%), and 2nd-6th (78, 11%) (1st vs. 2nd/3rd and 2nd-6th, P < 0.001). Hypertensives with a WCE were more likely to have ssIADs on 1st, (odds ratio [OR] 1.73 (95% confidence interval 1.04-2.86); 2nd/3rd, (OR 3.05 (1.68-5.53); and 2nd-6th measurements, (OR 2.58 (1.22-5.44). Nonhypertensive participants with a WCE were more likely to have a ssIAD on their first measurement (OR 3.82 (1.77 to -8.25) only.

conclusionsssIAD prevalence does not vary with ethnicity regardless of hypertensive status but is affected by the number of readings, suggesting the influence of WCE. Multiple readings should be used to confirm ssIADs.

Indexed as

Blood PressureRacial GroupsAdultAgedAsian PeopleBlack PeopleBlood Pressure Monitoring, AmbulatoryCaribbean RegionChi-Square DistributionCross-Sectional StudiesFemaleHumansHypertensionLinear ModelsLogistic ModelsMaleambulatory blood pressure monitoringblood pressureethnic grouphypertensioninterarm blood pressure differencessimultaneous blood pressure measurement methodwhite coat effect

Identifiers

PMID28475667
PMCPMC5861584
OpenAlexW2605966192

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.