<p>Cell phone use while driving is one of the commonest distracted driving behaviors that causes fatal crashes, and drivers are more likely to use their cell phones in work zones because of slow-moving traffic. The road safety campaign literature suggests that persuasive messages can positively influence safe driving behaviors leading to a reduction in crashes. Thus, this dissertation, guided by the risk perception attitude (RPA) framework, sought to examine how tailored messaging could serve as an effective communication strategy to promote positive attitudes and behavioral intentions in the context of cell phone use avoidance while driving through highway work zones. Findings from two studies, using a college student sample and a national sample of US young adults between 18 and 24 years old, revealed that the RPA framework likely does not serve as a useful audience segmentation strategy in this context because an overwhelming majority of participants (about 87%) belonged to the responsive group. A tailored messaging approach did not influence cell phone use avoidance while driving attitudes and intentions among the young adults because the majority of participants (70%) felt the messages were not designed uniquely for them and might not be personally relevant to them. However, the majority of participants (62%) reported that highway work zone safety was an important topic they would want to receive future messaging about because messages about this topic would help to save lives and protect public safety, drastically reduce crashes in highway work zones, and promote safe driving behaviors in highway work zones. Participants who were aware of the existence of state laws banning cell phone use while driving reported slightly higher attitudes toward and intentions to engage in safe driving behaviors compared to those who were not aware of the existence of such state laws. This dissertation suggests that instead of creating messages to raise risk perceptions and enhance efficacy perceptions, informing the young adult population in the US about the existence of laws banning cell phone use while driving might be an effective means to discourage them from using their cell phones while driving through highway work zones. By extending the RPA framework as an audience segmentation strategy, this dissertation also proposes a responsive group classification framework which could serve as a useful audience segmentation strategy in this study context to classify audiences into four groups to effectively tailor messages to them.</p>

Individuals have become more involved in health-related decisions, in part due to an unprecedented access to information that can be used to enhance both physical and mental health. Much of this health-related information is presented in a numerical format; unfortunately, research suggests many Americans may not possess the literacy skills necessary to comprehend numerical health-related information. More research needs to be conducted to examine numeracy and its role in cancer risk perceptions, and how those risk perceptions relate to cancer self-protective behaviors. The purpose of the current study was to: (a) examine socio-demographic variables associated with numeracy, (b) determine which factors are associated with cancer risk perceptions, and (c) apply the Risk Perception Attitude (RPA) Framework to examine associations between risk perception groups and cancer self-protective behaviors. The study used data from the 2007 Health Information National Trends Survey (HINTS), which was developed by the National Cancer Institute to collect nationally representative data on the U.S. public's use of cancer-related information. Logistic regression was used to assess the association between each dependent variable and independent variables associated with each research question. Results indicated age and education were associated with objective numeracy, whereas age, education, and occupational status were associated with subjective numeracy. Among participants with a previous cancer diagnosis, objective numeracy and smoking status were associated with a somewhat high/very high perceived risk of developing cancer in the future. Age, race/ethnicity, family cancer history, smoking status, and self-reported general health were associated with a somewhat high/very high perceived risk of developing cancer in the future among participants without a previous cancer diagnosis. RPA group was not significantly associated with cancer self-protective behaviors. Findings from this study have important implications for public health, including health communication and interventions designed to enhance health behaviors. Future research should focus on using a full objective numeracy scale with a nationally representative population and examining temporal relationships between cancer risk perceptions and health behaviors.