Fig. 2
(a) Objectively measured daily standard erythemal doses (SEDs) at baseline, follow-up 1 and 2 for intervention and control arms, stratified by traditional risk groups. Vertical bars indicate 95% confidence intervals (CI). At follow-up 1, the percentage difference and 95% CI comparing intervention with control arms in the low traditional risk group was 4.60% (95% CI: −5.08, 15.27; p = 0.36) and 2.49% (95% CI: −7.94, 14.14; p = 0.65) in the high traditional risk group. At follow-up 2, the percentage differences were 1.03% (95% CI: −4.84, 7.26; p = 0.74) and −1.44 (95% CI: −6.89 to 4.33, p = 0.62), respectively. (b) Self-reported daily total time spent outdoors at baseline, follow-up 1 and 2 for intervention and control arms, stratified by traditional risk groups. Vertical bars indicate 95% CI. At follow-up 1, the mean difference comparing intervention with control arms in the low traditional risk group was 0.07 (95% CI: −0.15, 0.30; p = 0.53) and −0.21 (95% CI: −0.43, 0.02; p = 0.07) in the high traditional risk group. At follow-up 2, the mean differences were 0.17 (95% CI: −0.06, 0.39; p = 0.15) and −0.03 (95% CI: −0.26, 0.20; p = 0.79), respectively. (c) Intentional tanning frequency (mean score of 1 item on Likert scale 1never—5always) at baseline, follow-up 1 and 2 for intervention and control arms, stratified by traditional risk groups. Vertical bars indicate 95% CI. At follow-up 1, the mean difference comparing intervention with control arms in the low traditional risk group was −0.10 (95% CI: −0.19, −0.01; p = 0.03) and −0.03 (95% CI: −0.11, 0.06; p = 0.53) in the high traditional risk group. At follow-up 2, the mean differences were −0.00 (95% CI: −0.09, 0.09; p = 1.00) and −0.02 (95% CI: −0.11, 0.06; p = 0.62), respectively. (d) Sun Protection Habits Index (mean score of Likert scale: 1never/rarely—4always, for six sun protection behaviors) at baseline, follow-up 1 and 2 for intervention and control arms, stratified by traditional risk groups. Vertical bars indicate 95% CI. At follow-up 1, the mean difference comparing intervention with control arms in the low traditional risk group was −0.03 (95% CI: −0.10, 0.04; p = 0.43) and 0.12 (95% CI: 0.05, 0.19; p = <0.001) in the high traditional risk group. At follow-up 2, the mean differences were −0.01 (95% CI: −0.08, 0.06; p = 0.83) and 0.06 (95% CI: −0.01, 0.13; p = 0.08), respectively. (e) Sunscreen use (one item from the Sun Protection Habits Index; mean score of Likert scale: 1never/rarely—4always) at baseline, follow-up 1 and 2 for intervention and control arms, stratified by traditional risk groups. Vertical bars indicate 95% CI. At follow-up 1, the mean difference comparing intervention with control arms in the low traditional risk group was −0.06 (95% CI: −0.19, 0.08; p = 0.41) and 0.28 (95% CI: 0.15, 0.42; p = <0.001) in the high traditional risk group. At follow-up 2, the mean differences were -0.07 (95% CI: −0.21, 0.06; p = 0.28) and 0.08 (95% CI: −0.06, 0.22; p = 0.26), respectively. (f) Hat use (one item from the Sun Protection Habits Index; mean score of Likert scale: 1never/rarely—4always) at baseline, follow-up 1 and 2 for intervention and control arms, stratified by traditional risk groups. Vertical bars indicate 95% CI. At follow-up 1, the mean difference comparing intervention with control arms in the low traditional risk group was −0.11 (95% CI: −0.24, 0.01; p = 0.08) and 0.16 (95% CI: 0.04, 0.29; p = 0.01) in the high traditional risk group. At follow-up 2, the mean differences were 0.01 (95% CI: −0.12, 0.14; p = 0.90) and 0.00 (95% CI: −0.12, 0.13; p = 0.97), respectively.
