ORCID Profile
0000-0001-6357-7307
Current Organisation
University of Tasmania Menzies Institute for Medical Research
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Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 23-08-2022
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.JASH.2018.06.015
Abstract: A single clinic measurement of blood pressure (BP) may be common in low- and middle-income countries because of limited medical resources. This study aimed to examine the potential misclassification error when only one BP measurement is used. Participants (n = 14,706, 53.5% females) aged 25-64 years were selected by multistage stratified cluster s ling from eight provinces, each representing one of the eight geographical regions of Vietnam. Measurements were made using the World Health Organization STEPS protocols. Data were analyzed using complex survey methods. For systolic BP, 62.7% had a higher first reading whereas 30.0% had a lower first reading, and 27.3% had a reduction of at least 5 mmHg whereas 9.6% had an increase of at least 5 mmHg. Irrespective of direction of change, increased variability in BP was associated with greater age, urban living, greater body size and fatness, reduced physical activity levels, elevated glucose, and raised total cholesterol. These measurement variations would lead to substantial misclassification in diagnosis of hypertension based on a single reading because almost 20% of subjects would receive a different diagnosis based on the mean of two readings.
Publisher: Public Library of Science (PLoS)
Date: 20-08-2021
DOI: 10.1371/JOURNAL.PONE.0256589
Abstract: The mid-life emergence of higher levels of total cholesterol (TC) for women than for men has been observed in different Western and Asian populations. The aim of this study was to investigate whether there is evidence of this in Vietnam and, if so, whether it can be explained by ageing, by body size and fatness, or by socio-demographic characteristics and behavioural factors. Participants (n = 14706, 50.9% females) aged 25–64 years were selected by multi-stage stratified cluster s ling from eight provinces each representing one of the eight geographical regions of Vietnam. Measurements were made using the World Health Organization STEPS protocols. Linear regression was used to assess the independent contributions of potential explanatory factors to mean levels of TC. Data were analysed using complex survey methods. Men and women had similar mean levels of body mass index (BMI), and men had modestly higher mean levels of waist circumference (WC), in each 5-year age category. The mean TC of women increased more or less continuously across the age range but with a step-up at age 50 years to reach higher concentrations on average than those of their male counterparts. The estimated step-up was not eliminated by adjustment for anthropometric indices including BMI or WC, or by adjustment for socio-demographic characteristics or behavioural factors. The estimated step-up was least for women with the greatest weight. There is a marked step-up in TC at age 50 years for Vietnamese women that cannot be explained by their age, or by their body fatness or its distribution, or by their socio-demographic characteristics or behavioural factors, and which results in greater mean levels of TC for middle-aged women than for their male counterparts in Vietnam.
Publisher: Springer Science and Business Media LLC
Date: 22-05-2023
DOI: 10.1038/S41440-023-01311-0
Abstract: Automated cuff measured blood pressure (BP) is the global standard used for diagnosing hypertension, but there are concerns regarding the accuracy of the method. In idual variability in systolic BP (SBP) lification from central (aorta) to peripheral (brachial) arteries could be related to the accuracy of cuff BP, but this has never been determined and was the aim of this study. Automated cuff BP and invasive brachial BP were recorded in 795 participants (74% male, aged 64 ± 11 years) receiving coronary angiography at five independent research sites (using seven different automated cuff BP devices). SBP lification was recorded invasively by catheter and defined as brachial SBP minus aortic SBP. Compared with invasive brachial SBP, cuff SBP was significantly underestimated (130 ± 18 mmHg vs. 138 ± 22 mmHg, p 0.001). The level of SBP lification varied significantly among in iduals (mean ± SD, 7.3 ± 9.1 mmHg) and was similar to level of difference between cuff and invasive brachial SBP (mean difference –7.6 ± 11.9 mmHg). SBP lification explained most of the variance in accuracy of cuff SBP (R 2 = 19%). The accuracy of cuff SBP was greatest among participants with the lowest SBP lification (p trend 0.001). After cuff BP values were corrected for SBP lification, there was a significant improvement in the mean difference from the intra-arterial standard ( p 0.0001) and in the accuracy of hypertension classification according to 2017 ACC/AHA guideline thresholds ( p = 0.005). The level of SBP lification is a critical factor associated with the accuracy of conventional automated cuff measured BP.
Publisher: Springer Science and Business Media LLC
Date: 16-01-2021
Publisher: Oxford University Press (OUP)
Date: 19-10-2014
DOI: 10.1093/NTR/NTU202
Abstract: To supplement limited information on tobacco use in Vietnam, data from a nationally-representative population-based survey was used to estimate the prevalence of smoking among 25-64 year-olds. This study included 14,706 participants (53.5% females, response proportion 64%) selected by multi-stage stratified cluster s ling. Information was collected using the World Health Organization STEPwise approach to surveillance of risk factors for non-communicable disease (STEPS) questionnaire. Smoking prevalence was estimated with stratification by age, calendar year, and birth year. Prevalence of ever-smoking was 74.9% (men) and 2.6% (women). Male ever-smokers commenced smoking at median age of 19.0 (interquartile range [IQR]: 17.0, 21.0) years and smoked median quantities of 10.0 (IQR: 7.0, 20.0) cigarettes/day. Female ever-smokers commenced smoking at median age of 20.0 (IQR: 18.0, 26.0) years and smoked median quantities of 6.0 (IQR: 4.0, 10.0) cigarettes/day. Prevalence has decreased in recent cohorts of men (p = .001), and its inverse association with years of education (p < .001) has strengthened for those born after 1969 (interaction p < .001). At 60 years of age, 53.0% of men who had reached that age were current smokers and they had accumulated median exposures of 39.0 (IQR: 32.0, 42.0) years of smoking and 21.0 (IQR: 11.5, 36.0) pack-years of cigarettes. The proportion of ever-smokers has decreased consistently among successive cohorts of women (p < .001). Smoking prevalence is declining in recent cohorts of men, and continues to decline in successive cohorts of women, possibly in response to anti-tobacco initiatives commencing in the 1990s. Low proportions of quitters mean that Vietnamese smokers accumulate high exposures despite moderate quantities of cigarettes smoked per day.
Publisher: Springer Science and Business Media LLC
Date: 10-06-2016
Publisher: Public Library of Science (PLoS)
Date: 29-05-2018
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 2023
Publisher: Public Library of Science (PLoS)
Date: 20-10-2015
Publisher: Cambridge University Press (CUP)
Date: 12-05-2016
DOI: 10.1017/S0007114516001690
Abstract: The aims of the present study were to provide nationally representative data on fruit and vegetable consumption in Vietnam, and to assess the accuracy of the reported numbers of ‘standard servings’ consumed. Data analysed were from a multi-stage stratified cluster survey of 14 706 participants (46·5 % males, response proportion 64·1 %) aged 25−64 years in Vietnam. Measurements were made in accordance with the WHO STEPwise approach to surveillance of non-communicable diseases (STEPS) protocols. Approximately 80 % of Vietnamese people reported having less than five servings of fruit and vegetables daily in a typical week. Fruit and vegetable intake reported in ‘standard serving’ sizes was positively correlated with levels of education completed and household income ( P ·001 for trend). The correlations between summary values for each province reflect some known demographic, geographical and climatic characteristics of the country. For ex le, provinces at higher latitude had higher mean servings of vegetables ( r 0·90), and provinces with higher proportions of urban population had higher mean servings of fruit ( r 0·40). In conclusion, about eight in ten Vietnamese people aged 25–64 years did not meet WHO recommendations for daily consumption of at least five servings of fruit and vegetables. On the basis of the consistency of the data collected with other estimates and with physical and demographic characteristics of the country, the WHO STEPS instrument has construct validity for measuring fruit and vegetable intake, but with two issues identified. The issues were seasonal variation in reporting and a limitation on the usefulness of the information for associative analyses.
Publisher: Oxford University Press (OUP)
Date: 08-07-2015
Abstract: To provide nationally representative data on alcohol consumption in Vietnam and to assess whether reported numbers of 'standard drinks' consumed have evidence of validity (particularly in rural areas where home-made alcohol is consumed from cups of varying size). A nationally representative population-based survey of 14,706 participants (46.5% males, response proportion 64.1%) aged 25-64 years in Vietnam. Measurements were made in accordance with WHO STEPS protocols. Data were analysed using complex survey methods. Among men, 80% reported drinking alcohol during the last year, and 40% were hazardous/harmful drinkers. Approximately 60% of men and <5% of women had consumed alcohol during the last week, with one-in-four of the men reporting having consumed at least five standard drinks on at least one occasion. Numbers of standard drinks reported by men were associated with blood pressure/hypertension, particularly in rural areas (P < 0.001 for trend). Most of the calibration and discrimination possible from self-reported information on alcohol consumption was provided by binary responses to questions on whether or not alcohol had been consumed during the reference period. Alcohol use and harmful consumption were common among Vietnamese men but less pronounced than in Western nations. Self-reports of quantity of alcohol consumed in terms of standard drinks had predictive validity for blood pressure and hypertension even in rural areas. However, using detailed measures of consumption resulted in only minor improvements in prediction compared to simple measures.
Location: Australia
No related grants have been discovered for Tan Bui.