“…Secondary measures and outcomes (measured at baseline, 6 and 12 months) include: - demographics and clinical variables: age, gender, marital status, postcode, highest education level, occupation, history of skin cancer (melanoma, squamous cell carcinoma, basal cell carcinoma), skin and hair type (density of freckles on arms before age 20, natural hair colour at age 15, number of severe sunburns aged 2–18), number of raised moles on both arms, measured at baseline only, 21 22 collected as part of the baseline eligibility assessment;
- sun protection habits scale developed by Glanz et al in the USA for a multicomponent skin cancer prevention programme; this comprises five items measured using a four-point Likert scale, and relating to use of sun protection, sun and sunbed habits, and episodes of sunburn in the previous year, 28 as we hypothesise that the App reminders will prompt people and reinforce the messages on sun protection;
- skin self-examination benefits and barriers scale: validated by Manne and Lessin in the USA among melanoma survivors, and developed from previous work on mammography and family members of patients with colorectal cancer. 29 The benefits scale has seven items (α=0.71) and the barriers scale has 10 items (α=0.74);
- Melanoma Worry Scale (MWS) validated by Moye et al in the USA, 30 and adapted from the Breast Cancer Worry Scale; 31 this measure comprises four items, scored 1 to 4, with possible scores ranging from 4 to 17, and higher scores indicating higher levels of worry
- Perceived melanoma risk: drawn from Manne and Lessin’s measures, 29 these two items have been widely used for melanoma and other cancer risk assessments to assess estimated percent risk of developing melanoma, and perceived risk compared with a person of the same age (relative risk);
- Self-efficacy for consulting without delay: A 10-item self-completed scale summed to score 10–100, was used in a primary care trial for lung symptoms and showed good internal reliability (Cronbach α=0.85). 32 33 It has been adapted for this trial, and reduced to eight items, for example.
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