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This study aims to broaden the understanding of the motivational factors influencing vaccine acceptance framed as product country image (PCI) by exploring the role of overall country image (OCI), vaccine knowledge and information inconsistency, in addition to the three most commonly investigated constructs: vaccine efficacy, fear of vaccine and social norm. A self-administered questionnaire was distributed online to 593 Vietnamese participants to collect data on COVID-19 vaccines from four different countries: the USA, the UK, Russia and China. Structural equation modelling was employed to test the proposed model and hypotheses. The results indicated that OCI had a positive effect on vaccine acceptance for vaccines from the USA and Russia, but a non-significant effect for vaccines from the UK and a negative effect for vaccines from China. Vaccine efficacy, social norm and subjective knowledge had a positive effect for most vaccines, while fear of the vaccine and information inconsistency had negative effects for certain vaccines. The results suggest that vaccine efficacy and social norm are more stable and significant predictors of vaccine acceptance than other constructs. Moreover, OCI moderated the effects of vaccine efficacy, fear of the vaccine, information inconsistency, subjective knowledge and social norm on vaccine acceptance for certain vaccines.

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Introduction: In the area of environmental psychology, time and the temporal perspective have often been used as an overarching framework to explain or predict environmental outcomes. This study aims to introduce a new Time Importance Scale (TIS) based on the attitude strength theory and to assess its nomological validity in comparison with the more established Temporal Focus Scale (TFS) in the context of consumers' willingness to pay more for environmentally friendly products. The new TIS scale is short and simple to manage. Method: The study proposes competing plausible structural models testing alternative relationships between future time perspective (FTP) and environmental values using a nationwide representative survey sample of 633 Norwegians. Results: The results confirm the convergent and discriminant validity of the new TIS scale. However, the direct association between the TIS scale and willingness to pay for environmentally friendly products is weak or non-significant depending on the alternative models used to validate the nomological validity. Discussion: The new TIS scale provides evidence of a possible causal chain, FTP → environmental values → willingness to pay, with strong associations between the present TIS and hedonic values and between the future TIS and biospheric values. Environmental values are activated by FTP. In most cases, the new TIS outperforms the established TFS in nomological validity. Future research should validate our findings in experimental trials to demonstrate more substantial causal relationships.

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This study uses the subscales of Consideration of Future Consequences (CFC) to explore the effects of future (CFC-future) and immediate (CFC-immediate) on convenience food consumption among teenagers in Vietnam. Furthermore, we investigate the mediating and dual role of hedonic and healthy eating values in the relationships between CFCs and convenience food consumption. Survey data from 451 teenagers in Central Vietnam and structural equation modelling were used to test the relationships in a proposed theoretical model. The results indicate that while CFC-immediate and hedonic eating value has a positive direct effect, CFC-future and healthy eating value has a negative direct effect on convenience food consumption. The findings also reveal that both CFC-immediate and CFC-future have positive effects on hedonic and healthy eating values. However, this study argues and tests the relative importance of the direct (asymmetric) effects of time perspectives on eating values, and finds that while CFC-future dominate in explaining healthy eating values, CFC-immediate dominate in explaining hedonic eating values.

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The present study aims to explore the relationship between conscientiousness and the consumption of healthy versus unhealthy main meals. Impulsive eating was tested as a mediator in this relationship, as well as direct effects of age on those constructs. A nationwide representative sample of 1,006 Norwegian adults (18-70 years) within a prospective design was used to test a theoretical model. The structural equation model (SEM), in combination with bootstrapping procedures in AMOS, was the principal analytical method. Conscientiousness was negatively associated with unhealthy and impulsive eating. Impulsive eating was a partial mediator between conscientiousness and unhealthy eating and a full mediator between conscientiousness and healthy eating. Age was positively correlated with conscientiousness and this relationship had an inverted U-shape form. Finally, age was negatively associated with unhealthy and impulsive eating, and positively associated with healthy eating. This study confirmed the relevance of conscientiousness for healthy, unhealthy, and impulsive eating.

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This study proposes that snacking behaviour may be either reflective and deliberate or impulsive, thus following a dual-process account. We hypothesised that chronic individual differences in food related self-control would moderate the relationships between reflective and impulsive processes. The reflective route was represented by an attitude toward unhealthy snacking, while the impulsive route was represented by the tendency to buy snack on impulse. A web survey was conducted with 207 students and employees at a Norwegian university, and a moderated hierarchical regression analysis using structural equation modelling was used to estimate the theoretical model. The findings showed that both attitudes towards unhealthy snacking and impulsive snack buying tendency were positively related to snack consumption. Food related self-control moderated the relation between attitude and behaviour, as well as the relation between impulsive snack buying tendency and behaviour. The effect of attitude on consumption was relatively strong when food related self-control was strong, while the effect of impulsive snack buying on consumption was relatively strong when food related self-control was weak. The results thus suggest that while weak self-control exposes individuals vulnerable to impulsive tendencies, strong self-control does not necessarily lead to less unhealthy snacking, but this depends on the valence of an individual's attitude.

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The purpose of this study is to apply the conceptual framework of the theory of planned behavior (TPB) to explain the consumption of a common food (fish) in Vietnam. We seek to understand the role of norms in explaining intention to consume, and descriptive norms is included as extensions of traditional constructs such as attitude, social norms, and perceived behavioral control. The data were derived from a cross-sectional sample of 612 consumers. Structural equation modeling was applied to test the relationships between constructs, and evaluate the reliability and the validity of the constructs. The results indicate that the models fit well with the data. Attitude, social norms, descriptive norms and behavioral control all had significantly positive effect on behavioral intention. Finally, both intention and perceived behavioral control were highly associated with the frequency of consumption of the common food investigated.

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