Trial Outcomes & Findings for Social-Media Intervention in Reducing Tanning in High-Risk Tanners (NCT NCT03441321)

Participants were primarily recruited by the internet research recruitment company Qualtrics Sample Providers. Qualtrics emailed a randomly selected sample frame of panel participants with a study invitation, which contained a brief description of the study procedures and a brief screening eligibility assessment. Qualtrics also supplemented recruitment with web advertisements posted on various websites and platforms of their partner organizations.

Following screening, eligible participants who indicated their interest were emailed by study staff a link to a web-based baseline survey that also included the implied consent form. After completing the baseline survey, participants were randomized to condition.

Social-Media Intervention in Reducing Tanning in High-Risk Tanners

Multilevel models (e.g., random coefficient) will be used to test the primary study hypothesis that participants who received the intervention will report less combined indoor and outdoor tanning behavior at a 8-month follow-up compared to those who received the control. If necessary, sensitivity analyses may control for individual-level covariates. For reporting purposes, total number of tanning session were summed. Items are measured on open-ended scales with minimum value of 0. Higher numbers report higher rates of tanning, a worse outcome considering it is a risk factor for skin cancer development.

Multilevel models (e.g., random coefficient) will be used. If necessary, sensitivity analyses may control for individual-level covariates. For reporting purposes, total number of tanning session were summed. Items are measured on open-ended scales with minimum value of 0. Higher numbers report higher rates of tanning, a worse outcome considering it is a risk factor for skin cancer development.

Multilevel models (e.g., random coefficient) will be used. If necessary, sensitivity analyses may control for individual-level covariates. Due to programming error in the study surveys, sunburn was not collected at 8 months as intended. Instead, data presented are from the 18-month, long-term follow-up.

Multilevel models (e.g., random coefficient) will be used. If necessary, sensitivity analyses may control for individual-level covariates. Intentions for both indoor and outdoor tanning were summed to create a single intentions scale. Indoor tanning intentions were assessed with the question "How likely are you to indoor tan (e.g., used a tanning bed, sun lamp, or tanning booth) in the next 12 months?" and outdoor intentions with the question "How likely are you to sunbathe or spend time lying in the sun in the next 12 months?" Both questions included response options on a 6-point scale ranging from extremely unlikely (coded as "1") to extremely likely (coded as "6"). The range of possible responses was 2 to 12 with higher scores indicating higher intentions (a worse outcome).