Uncertainty and Negative Emotions in Parental Decision-making on Childhood Vaccinations: Extending the Theory of Planned Behavior to the Context of Conflicting Health Information.

Delaying childhood vaccinations has become a public health threat. Numerous studies have shown that the proliferation of conflicting information about the health effects of childhood vaccinations leads parents to believe misinformation about the outcomes of these vaccinations. To build upon the limited understanding of how conflicting information affects decision-making of health protective behaviors, this study extends and applies the theory of planned behavior (TPB) in the context of childhood vaccinations. This study integrates perceived uncertainty as an antecedent of the TPB model, and incudes the negative emotions resulting from the uncertainty as a parallel predictor for the model to examine parents' acceptance of and engagement in childhood vaccinations. Drawing from a survey of with parents in the United States (N = 405), we found that both perceived uncertainty and subjective norms are strong predictors of parents' attitudes and perceived control regarding childhood vaccinations. Additionally, our study also proved that affective factors and the other three cognitive components in TPB are equally important on the formation of parents' intentions of childhood vaccinations. Theoretical and practical implications are discussed in this study.

Do state regulations on e-cigarettes have impacts on the e-cigarette prevalence?

BACKGROUND: We examine the association among five types of state regulations on electronic cigarettes (defining e-cigarettes, special tax, packaging, youth access and licensure) and initiation and current usage of e-cigarettes in 50 US states and the District of Columbia. METHODS: Data came from the 2017 Behavioral Risk Factor Surveillance System and the US e-cigarette regulations-50 state review by the Public Health Law Center. Logistic regressions were used to determine the odds of initiation and current use of e-cigarettes among individuals aged 18-24, 25-34 and the whole sample, adjusting for socio-demographic covariates. RESULTS: Despite the short history of state laws on e-cigarettes, each of the five state laws was associated with lower odds of initiation and use of e-cigarettes in the whole sample. In the 18-24 age group, only the licensure was associated with lower initiation. In the 25-34 age group, the licensure and taxation were related to lower initiation and current usage. There were significant differences of e-cigarette initiation and usage based on the number of state laws regulating e-cigarettes. CONCLUSIONS: Our analysis indicates the potential of states' policy efforts to regulate e-cigarettes comprehensively in leading significant changes to e-cigarette prevalence in their populations.

From Social Media to Mainstream News: The Information Flow of the Vaccine-Autism Controversy in the US, Canada, and the UK.

Despite increasing warnings about inaccurate information online, little is known about how social media contribute to the widespread diffusion of unverified health information. This study addresses this issue by examining the vaccine-autism controversy. By looking into a large dataset of Twitter, Reddit posts, and online news over 20 months in the US, Canada, and the UK, our time-series analysis shows that Twitter drives news agendas, and Reddit follows news agendas regarding the vaccine-autism debate. Additionally, the results show that both Twitter and Reddit are more likely to discuss the vaccine-autism link compared to online news content.