Baseline demographics of the intervention and control participants (N = 368).
Study retention was high, with 92.4% of participants (91.2% intervention, 93.5% control) completing the 12-week survey and 87.5% of participants (85.2% intervention, 89.8% controls) completing the 64-week survey. Participants at baseline reported overall high sun protection scores, with average protection scores near 3.0 indicating that participants “often” engaged in most of the protection behaviors. At 12 weeks, no statistically or clinically meaningful differences were found between groups for the primary outcome, the sun habit score (control 3.0±0.5 vs. intervention 2.9±0.5, t(337) = 1.90, p = 0.06; effect size = 0.21). Scores remained stable over the intervention period, both overall and for each separate behavior, and the repeated measures analysis showed no significant difference in overall or individual scores between the two arms during the intervention period (