As purchase power and consumption knowledge increase, consumers gradually demand safer and healthier products. In addition, consumers focus greater attention on organic food. This study investigates the relationship between environmental consciousness and organic food purchase intention with the mediating roles of perceived food quality and price sensitivity. The objective is to shed new light on our understanding of consumers’ perceptions and behavioral intentions toward organic food. Using sample data of 518 consumers in different food retailers in China, empirical results show that environmental consciousness has a positive impact on organic food purchase intention. Perceived food quality has a mediating effect on the link between environmental consciousness and organic food purchase intention. Price sensitivity moderates the relationship between perceived food quality and organic food purchase intention. Furthermore, price sensitivity moderates the indirect effect of environmental consciousness on organic food purchase intention through perceived food quality.

Purpose Emerging markets are showing rapid growth and retaining high potential for the adoption of e-commerce and online shopping. Among the many high potential markets in Asia–Pacific, Vietnam has had a rapid economic development with an average GDP growth rate of 6.19 percent for the last two decades. To tap the growing online market of Vietnam, the purpose of this paper is to draw on adoption theory and the technology acceptance model to investigate the interrelationships among consumer perceptions of web design, reliability, privacy and customer service and their effects on purchase intention. Design/methodology/approach Survey data were collected from 221 consumers in Vietnam. Structural equation modeling was used to analyze the data. Findings Empirical findings show that consumer perception of web design is positively related to perceptions of reliability, privacy, customer service and purchase intention. Consumer perception of reliability is positively related to perception of customer service but not to purchase intention. Consumer perception of privacy is also positively related to perception of customer service but not to purchase intention. Finally, consumer perception of customer service is positively related to purchase intention. Originality/value This study provides empirical evidence to understand the consumer perceptions of online shopping in the specific context of Vietnam. Findings of this study will benefit future researchers who will study consumer behavior in the e-commerce B2C industry, particularly those who are interested in the expanding e-commerce market in Vietnam. Furthermore, this study provides empirical evidence to assist business managers of domestic and foreign firms to further understand Vietnamese consumers. Knowledge of consumer behavior from the specific culture of a developing country may assist business managers advance their decision-making quality in developing markets.

Antiretroviral therapy (ART) retention and 5 early-warning indicators (EWIs) of HIV drug resistance (HIVDR) were abstracted at 27 adult and 4 pediatric clinics in Vietnam in 2009. Of 4531 adults and 313 children, 81.2% and 84.4% respectively were still on ART at 12 months. More than 90% of the clinics monitored achieved the World Health Organization (WHO) targets for lost-to-follow-up (LTFU), ART prescribing practices, and ARV supply continuity. Only 83.9% of the clinics met the target for first-line ART retention and 79.3% met the target for clinic appointment-keeping. Clinic factors (i.e. number of patients, administrative level, and geographical region) were associated with ART retention and LFTU. Data were useful in guiding public health action to optimize ART services.

Purpose Adequate patient allocation is pivotal for optimal resource management in strained healthcare systems, and requires detailed knowledge of clinical and virological disease trajectories. The purpose of this work was to identify risk factors associated with need for invasive mechanical ventilation (IMV), to analyse viral kinetics in patients with and without IMV and to provide a comprehensive description of clinical course. Methods A cohort of 168 hospitalised adult COVID-19 patients enrolled in a prospective observational study at a large European tertiary care centre was analysed. Results Forty-four per cent (71/161) of patients required invasive mechanical ventilation (IMV). Shorter duration of symptoms before admission (aOR 1.22 per day less, 95% CI 1.10–1.37, p < 0.01) and history of hypertension (aOR 5.55, 95% CI 2.00–16.82, p < 0.01) were associated with need for IMV. Patients on IMV had higher maximal concentrations, slower decline rates, and longer shedding of SARS-CoV-2 than non-IMV patients (33 days, IQR 26–46.75, vs 18 days, IQR 16–46.75, respectively, p < 0.01). Median duration of hospitalisation was 9 days (IQR 6–15.5) for non-IMV and 49.5 days (IQR 36.8–82.5) for IMV patients. Conclusions Our results indicate a short duration of symptoms before admission as a risk factor for severe disease that merits further investigation and different viral load kinetics in severely affected patients. Median duration of hospitalisation of IMV patients was longer than described for acute respiratory distress syndrome unrelated to COVID-19.

The Ratios Conjecture of Conrey, Farmer and Zirnbauer predicts the answers to numerous questions in number theory, ranging from n-level densities and correlations to mollifiers to moments and vanishing at the central point. The conjecture gives a recipe to generate these answers, which are believed to be correct up to square-root cancelation. These predictions have been verified, for suitably restricted test functions, for the 1-level density of orthogonal and symplectic families of L-functions. In this paper we verify the conjecture's predictions for the unitary family of all Dirichlet $L$-functions with prime conductor; we show square-root agreement between prediction and number theory if the support of the Fourier transform of the test function is in (-1,1), and for support up to (-2,2) we show agreement up to a power savings in the family's cardinality.Comment: Version 2: 24 pages, provided additional details, fixed some small mistakes and expanded the exposition in place