ORCID Profile
0000-0002-5675-9396
Current Organisation
Phenikaa University
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Publisher: Elsevier BV
Date: 07-2021
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 02-2020
Publisher: Springer Science and Business Media LLC
Date: 29-01-1997
Publisher: World Scientific Pub Co Pte Lt
Date: 15-06-1994
DOI: 10.1142/S0217979294000725
Abstract: Positron lifetime measurements have been carried out in an amine-cured epoxy polymer TGDDM/DDS/BFE as a function of annealing temperature. The measured spectra are best fitted to three component analysis. From the measured long lifetime component the average size of the free volume holes has been calculated following Nakanishi et al.’s treatment. Variation of lifetime parameters with temperature indicates the preferential trapping of positronium atoms in the regions of increased free volume hole sizes. On the other hand, positrons are being trapped at micro-voids in the ordered regions. The slow increase of free volume upto 170°C may be due to the thermal expansion and we measure 170° C as the T g for this epoxy. Lifetime data are also used to calculate the trapping rates in the ordered and disordered regions of the epoxy based on Goldanskii’s kinetic relations.
Publisher: European Centre for Disease Control and Prevention (ECDC)
Date: 06-2023
DOI: 10.2807/1560-7917.ES.2023.28.22.2200706
Abstract: Vaccines play a crucial role in the response to COVID-19 and their efficacy is thus of great importance. To assess the robustness of COVID-19 vaccine efficacy (VE) trial results using the fragility index (FI) and fragility quotient (FQ) methodology. We conducted a Cochrane and PRISMA-compliant systematic review and meta-analysis of COVID-19 VE trials published worldwide until 22 January 2023. We calculated the FI and FQ for all included studies and assessed their associations with selected trial characteristics using Wilcoxon rank sum tests and Kruskal–Wallis H tests. Spearman correlation coefficients and scatter plots were used to quantify the strength of correlation of FIs and FQs with trial characteristics. Of 6,032 screened records, we included 40 trials with 54 primary outcomes, comprising 909,404 participants with a median s le size per outcome of 13,993 (interquartile range (IQR): 8,534–25,519). The median FI and FQ was 62 (IQR: 22–123) and 0.50% (IQR: 0.24–0.92), respectively. FIs were positively associated with s le size (p 0.001), and FQs were positively associated with type of blinding (p = 0.023). The Spearman correlation coefficient for FI with s le size was moderately strong (0.607), and weakly positive for FI and FQ with VE (0.138 and 0.161, respectively). This was the largest study on trial robustness to date. Robustness of COVID-19 VE trials increased with s le size and varied considerably across several other important trial characteristics. The FI and FQ are valuable complementary parameters for the interpretation of trial results and should be reported alongside established trial outcome measures.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Springer Science and Business Media LLC
Date: 28-04-2021
DOI: 10.1186/S12879-021-06067-X
Abstract: International air travel plays an important role in the global spread of SARS-CoV-2, and tracing of close contacts is an integral part of the public health response to COVID-19. We aimed to assess the timeliness of contact tracing among airline passengers arriving in Vietnam on flights containing COVID-19 cases and investigated factors associated with timeliness of contact tracing. We included data from 2228 passengers on 22 incoming flights between 2 and 19 March 2020. Contact tracing duration was assessed separately for the time between the date of index case confirmation and date of contact tracing initiation (interval I), and the date of contact tracing initiation and completion (interval II). We used log-rank tests and multivariable Poisson regression models to identify factors associated with timeliness. The median duration of interval I and interval II was one (IQR: 1–2) and 3 days (IQR: 2–5), respectively. The contact tracing duration was shorter for passengers from flights where the index case was identified through mandatory testing directly upon arrival (median = 4 IQR: 3–5) compared to flights with index case detection through self-presentation at health facilities after arrival (median = 7 IQR: 5–8) ( p -value = 0.018). Cumulative hazards for successful tracing were higher for Vietnamese nationals compared to non-Vietnamese nationals ( p 0.001). Contact tracing among flight passengers in the early stage of the COVID-19 epidemic in Vietnam was timely though delays occurred on high workload days. Mandatory SARS-CoV-2 testing at arrival may reduce contact tracing duration and should be considered as an integrated screening tool for flight passengers from high-risk areas when entering low-transmission settings with limited contact tracing capacity. We recommend a standardized risk-based contact tracing approach for flight passengers during the ongoing COVID-19 epidemic.
Publisher: The Korean Society of Medical Informatics
Date: 31-10-2022
DOI: 10.4258/HIR.2022.28.4.307
Abstract: Objectives: Online misinformation has reached unprecedented levels during the coronavirus disease 2019 (COVID-19) pandemic. This study analyzed the magnitude and sentiment dynamics of misinformation and unverified information about public health interventions during a COVID-19 outbreak in Da Nang, Vietnam, between July and September 2020.Methods: We analyzed user-generated online information about five public health interventions during the Da Nang outbreak. We compared the volume, source, sentiment polarity, and engagements of online posts before, during, and after the outbreak using negative binomial and logistic regression, and assessed the content validity of the 500 most influential posts.Results: Most of the 54,528 online posts included were generated during the outbreak (n = 46,035 84.42%) and by online newspapers (n = 32,034 58.75%). Among the 500 most influential posts, 316 (63.20%) contained genuine information, 10 (2.00%) contained misinformation, 152 (30.40%) were non-factual opinions, and 22 (4.40%) contained unverifiable information. All misinformation posts were made during the outbreak, mostly on social media, and were predominantly negative. Higher levels of engagement were observed for information that was unverifiable (incidence relative risk [IRR] = 2.83 95% confidence interval [CI], 1.33–0.62), posted during the outbreak (before: IRR = 0.15 95% CI, 0.07–0.35 after: IRR = 0.46 95% CI, 0.34-0.63), and with negative sentiment (IRR = 1.84 95% CI, 1.23–2.75). Negatively toned posts were more likely to be misinformation (odds ratio [OR] = 9.59 95% CI, 1.20–76.70) or unverified (OR = 5.03 95% CI, 1.66–15.24).Conclusions: Misinformation and unverified information during the outbreak showed clustering, with social media being particularly affected. This indepth assessment demonstrates the value of analyzing online “infodemics” to inform public health responses.
Publisher: American Chemical Society (ACS)
Date: 21-07-2023
Publisher: Korean Society of Global Health
Date: 2020
Publisher: Elsevier BV
Date: 10-2021
Publisher: Springer Science and Business Media LLC
Date: 05-1995
DOI: 10.1007/BF01538773
Publisher: Wiley
Date: 16-11-1996
Publisher: SAGE Publications
Date: 2020
Abstract: Vietnam declared its national roadmap towards Sustainable Development Goals number 6 by 2030. However, specific supporting programmes and financial means to proceed with the roadmap have not been passed on. Evidence on the financing for water, sanitation, and hygiene (WASH) being allocated or spent has not been well documented in Vietnam. This study aimed to obtain an overview and assessed the public funding across the WASH sector of Vietnam in 3 fiscal years 2016, 2017, and 2018. A cross-sectional study was conducted for information about the public financing for WASH at both national and sub-national levels. An activity-based costing approach was applied to determine WASH-related public expenditure. Fourteen focus group discussions with key stakeholders were used to identify the WASH activities and to access financial reports of these relevant institutions. TrackFin methodology was used to assemble the public financing for WASH in Vietnam. The public expenditure of WASH declined by about 30.7% over the 3 fiscal years, from US $2016 million in 2016 to US $1397 million in 2018. Meanwhile, this expenditure allocated to the poor or mountainous areas increased by 3 folds. The highest proportion of WASH public funding was invested in sanitation through large network systems (59.07% of the total public expenditure), whereas the lowest was in hygiene promotion and handwashing facilities. The domestic budget was still the main source of public financing for WASH services, with 2 largest shares coming from government revenues (47.24%) and repayable loans (20.49%). The main source of financing for WASH was from the government, yet its public expenditure has been decreased. A refined roadmap with specific steps for a sustainable WASH financing system in Vietnam, particularly to leverage government and private sector resources, is required to ensure no one is left behind.
Publisher: Springer Science and Business Media LLC
Date: 19-08-2022
DOI: 10.1186/S12960-022-00760-X
Abstract: Community health workers (CHWs) involved in the COVID-19 response might be at increased risk of developing depression, though evidence is scarce. We investigated effects of COVID-19-related work on changes in depression levels among CHWs in Vietnam and identified sub-groups among CHWs who are at particular risk of developing severe depression. We conducted a cross-sectional online survey among 979 CHWs who were involved in the COVID-19 response in Vietnam, in particular during the 2021 Tet holiday outbreak between January and March 2021. Respondents were asked to report depression symptoms at two-time points, before the start of the COVID-19 pandemic (average June to December 2019) and during the 2021 Tet holiday outbreak using the PHQ-9 mental health questionnaire. We estimated depression levels at both time points and developed univariate and multivariable logistic regression models to estimate odds ratios and 95% confidence intervals (95% CIs) to explore the association between deterioration to high depression levels and selected risk factors. Median depression levels among CHWs in Vietnam doubled from 3 (IQR = 2–7) before COVID-19 to 6 (IQR = 3–9) on the PHQ-9 scale during the Tet holiday outbreak. The proportion with normal/minimal levels decreased from 77.1% (95% CI = 74.4–79.7) to 50.9% (95% CI = 47.7–54) ( p -value 0.001), while the proportion of CHWs with moderate, moderately severe, and severe depression levels increased 4.3, 4.5, and five-fold, respectively. Less sleep and poor sleep quality, working in unfavorable work environments, and being involved in contact tracing and the organization of quarantine for suspected cases were associated with an increased risk of deterioration to high depression levels. We found a substantial increase in overall depression levels among CHWs in Vietnam due to their COVID-19 related work and a particularly worrisome rise in CHWs suffering from severe depression. CHWs are an indispensable yet often overlooked cadre of work in many low- and middle-income countries and shoulder a heavy psychological burden during the COVID-19 pandemic. Targeted psychological support for CHWs is needed to improve their mental health and to ensure the sustainability of community-based health interventions during COVID-19 and future epidemics.
Publisher: SAGE Publications
Date: 10-09-2020
Abstract: This study investigates the prevalence of tobacco and alcohol uses and associated factors among 12 ethnic minorities in Vietnam in 2019. A cross-sectional survey was conducted among 5172 people aged ≥15 years. The prevalence of smoking and drinking was 19.7% and 29.9%, respectively, and significantly higher among men than women. These numbers were heterogeneous across ethnic minorities. Smoking prevalence was high among Ba Na (25.9%), Cham An Giang (22.3%), Khmer (23.5%), La Hu (26.3%), Ta Oi (30.7%), and Bru Van Kieu (29.6%) ethnicities whereas that of Gie Trieng and Mnong ethnicities was low (3.7% and 9.5%, respectively). Drinking prevalence ranged from 1.4% in Cham An Giang ethnicity to 68.6% in Ba Na ethnicity. A wide ethnic disparity on tobacco and alcohol use could be explained by the ethnic variation of lifestyles, social norms, and cultural features. Our findings suggest the need to develop ethnic-specific interventions to mitigate the smoking and drinking prevalence.
Publisher: Cold Spring Harbor Laboratory
Date: 26-03-2021
DOI: 10.1101/2021.03.26.21254389
Abstract: Background Adolescence is a vulnerable period for many lifestyle risk behaviors. In this study, we aimed to 1) examine a clustering pattern of lifestyle risk behaviors 2) investigate roles of the school health promotion programs on this pattern among adolescents in Vietnam. Methods We analyzed data of 7,541 adolescents aged 13-17 years from the 2019 nationally representative Global School-based Student Health Survey, conducted in 20 provinces and cities in Vietnam. We applied the latent class analysis to identify groups of clustering and used Bayesian 2-level logistic regressions to evaluate the correlation of school health promotion programs on these clusters. We reassessed the school effect size by incorporating different informative priors to the Bayesian models. Findings The most frequent lifestyle risk behavior among Vietnamese adolescents was physical inactivity, followed by unhealthy diet, and sedentary behavior. Most of students had a cluster of at least two risk factors and nearly a half with at least three risk factors. Latent class analysis detected 23% males and 18% females being at higher risk of lifestyle behaviors. Consistent through different priors, high quality of health promotion programs associated with lower the odds of lifestyle risk behaviors (highest quality schools vs. lowest quality schools males: Odds ratio (OR) = 0.67, 95% Highest Density Interval (HDI): 0.46 - 0.93 females: OR = 0.69, 95% HDI: 0.47 - 0.98). Interpretation Our findings demonstrated the clustering of specific lifestyle risk behaviors among Vietnamese in-school adolescents. School-based interventions separated for males and females might reduce multiple health risk behaviors in adolescence.
Publisher: Springer Science and Business Media LLC
Date: 15-04-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CC90365F
Publisher: Weston Medical Publishing
Date: 28-02-2023
DOI: 10.5055/JEM.0742
Abstract: Surveillance is the backbone of any response to an infectious disease outbreak, and comprehensive evaluation of surveillance systems is crucial. However, structured evaluations of surveillance systems during the COVID-19 pandemic are scarce. We conducted a after action review (AAR) of the performance of the COVID-19 surveillance system in Quang Ninh Province, Vietnam, during 2020 using the COVID-19-specific AAR methodology developed by the World Health Organization in combination with guidance from the US Centers for Disease Control and Prevention (CDC). We conducted a stakeholder survey, document reviews, and key informant interviews with staff from Quang Ninh CDC’s COVID-19 surveillance system. The COVID-19 surveillance system was based on the pre-existing surveillance system in the province. The system’s strengths were early preparation for emergency response, strong governance and central coordination, and multidisciplinary collaboration. Stakeholders agreed that the system proved useful and adaptive to the fast-evolving COVID-19 situation but was weakened by overly complex systems, redundant administrative processes, unclear communication channels, and lack of resources. Overall, the surveillance systems in Quang Ninh province proved effective in containing COVID-19 and adaptive in a fast-changing epidemiological context. Several recommendations were made based on identified areas of concern that are of relevance for COVID-19 surveillance systems in Vietnam and similar settings.
Publisher: Elsevier BV
Date: 10-1997
Publisher: SAGE Publications
Date: 14-07-2022
Publisher: Elsevier BV
Date: 10-1997
No related grants have been discovered for Thi Ngoc Anh Hoang.