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Clinical Trial Summary

Many population-level public health strategies-including media campaigns and other behavioral interventions, screening recommendations, and vaccination policies-rely on messaging to promote cancer prevention and control. These strategies do not take place in a vacuum; rather, they occur in the context of a broader public information environment, which is increasingly characterized by conflicting and often controversial health information. Although studies have documented that such information is prevalent, a critical question remains unanswered: does exposure to conflicting health information in people's routine interactions with the broader information environment threaten the success of message-based population-level public health strategies? And, if so, who is most susceptible to the effects of such exposure? This study will provide a rigorous empirical test of these critical answered questions, guided by two specific aims: First, to evaluate whether prior exposure to conflicting health information influences responses to subsequent unrelated and uncontested health messages, a phenomenon that has been described as "carryover effects" (Primary Aim); and second, to identify whether there are individual-level differences in how conflict affects responses to these unrelated and uncontested health messages (Secondary Aim).


Clinical Trial Description

To accomplish these aims, an online survey-based experiment using a population-based sample of U.S. adults (anticipated N=1,800) will be conducted. At 2 time points across a 28-day period, participants will be exposed to news stories and social media posts about 6 health topics: mammography screening, prostate-specific antigen (PSA) testing, Vitamin D supplementation, carbohydrate consumption, alcohol consumption, and breastfeeding. Participants will be randomized to 1 of 2 treatment groups that differ only in the amount of conflict presented in these news and social media posts (conflict, no conflict). At a third time point, after the exposure to conflict period, all participants will be exposed to 3 (out of a possible 9) messages from existing health campaigns about 3 behaviors for which there is scientific consensus: fruit and vegetable consumption, colorectal cancer screening, and physical activity. To assess carryover effects (Primary Aim), participants' receptivity to these messages-as measured through several affective and cognitive responses (e.g., confidence in the evidence presented)-will be measured. Message receptivity is expected to be lower among those who were randomized to receive conflicting health information. Individual-level differences in message receptivity are possible; thus exploratory analyses (Secondary Aim) will be conducted to assess whether carryover effects of exposure to conflict may be more pronounced among certain groups (e.g., those with greater trust in media sources, those of lower socioeconomic position). ;


Study Design


Related Conditions & MeSH terms


NCT number NCT04247529
Study type Interventional
Source University of Minnesota
Contact
Status Completed
Phase N/A
Start date July 20, 2020
Completion date August 31, 2020

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