Guilt appeals are successful in encouraging healthy behaviors as proved by many studies. However, there has been no previous systematic review of guilt research in health domain. Thus, a meta-analysis of eight studies (2,061 subjects) was conducted to examine the effectiveness of guilt on health-related attitudes and intentions. The result revealed a strong positive overall effect of guilt (r = .49, 95% CI 0.31-0.64) despite the heterogeneity. Guilt had a stronger power in changing attitudes/intentions when paired with text-only messages than text-picture mixed messages. For studies using a college sample, the percentage of females marginally moderated the effect of guilt. Whether a message was self focused or other focused did not significantly moderate the effect of guilt. Future directions and practical implications are provided.
Purpose
Social media, such as Twitter, has become the first and the most frequent place to visit in order to gain information and establish situational awareness in emergencies and disasters. The purpose of this paper is to examine public opinion on Twitter in different disaster stages using the case of Hurricane Irma.
Design/methodology/approach
More than 3.5m tweets capturing the entire disaster lifecycle were collected and analyzed. Topic modeling was used to generate topics at each disaster stage based on Fink’s (1986) four-stage model of crisis and disaster: prodromal, acute, chronic and termination stages.
Findings
The results revealed that media reliance varied across different stages. All topics in the prodromal stage were associated with the early warning and real-time news. The topic of lessons learned from Hurricane Harvey was the most popular at this stage. The acute stage recorded the highest number of daily tweets. The most popular topic was the safety of people and animals. In the chronic stage too, the safety of people and animals remained a major concern. Heroic and anti-social behaviors also received substantial attention. In the termination stage, climate change was the most frequently discussed topic. Politics-related discussions were heated.
Originality/value
The results extended and enhanced the four-stage model of crisis and disaster. These findings can help government agencies and crisis managers address audience needs effectively at various crisis stages in a timely manner.
Online anti-vaccine articles contribute to the anti-vaccine movement, which leads to recent outbreaks of vaccine-preventable diseases. Previous studies indicate that anti-vaccine articles are easy to read and understand, which may increase their abilities to engage viewers. The present study aims to examine if readability levels are related to engagement. Using combination of terms to search for vaccine articles in Google in May 2017, this study examined 541 pro-vaccine online articles with a total of 508,571 words and 382 anti-vaccine articles with a total of 843,805 words. Almost all vaccine articles exceeded the American average reading comprehension level. No significant difference in readability was found between pro- and anti-vaccine articles. Pro-vaccine articles that could only be understood by college graduates were less engaging than those with lower readability levels. No significant relationship between anti-vaccine articles’ readability and engagement was discovered. Different vaccine topics had different readability and engagement levels, which implied that certain combinations of themes and readability levels could enhance the health messages’ persuasion effect. Recommendations for designing effective health messages are provided.
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