Table 1.
Primary and Secondary Outcome Measures
| Domain | Variable | Number of items | SCALE | MEASUREMENT STRATEGIES |
|---|---|---|---|---|
| Primary outcome variables | ||||
| Intention | 4 | 1 (strongly disagree) to 7 (strongly agree) | "I am willing to perform sun-protective behaviours."; "I intend to perform sun-protective behaviours."; "I plan to perform sun-protective behaviours."; "It is likely that I will perform sun-protective behaviours." | |
| Behaviour | 3 | 1 (never) to 7 (always) | "Think about the past week. In general, how often did you perform sun-protective behaviour?" "Think about the past week, how often did you perform sun-protective behaviour on a school day?"; "Think about the past week, how often did you perform sun-protective behaviour on the weekend?" | |
| Secondary outcome variables | ||||
| Attitude | 6 | 1 (pleasant) to 7 (unpleasant) 1 (good) to 7 (bad) 1 (wise to 7 (unwise) 1 (difficult) easy (7) 1 (nice) to 7 (awful) 1 (negative) to 7 (positive) |
"Performing sun-protective behaviours every time I go in the sun for more than 10 minutes during the next week, would be..." | |
| Subjective Norms | 2 | 1 (strongly disagree) to 7 (strongly agree) | "Those people who are important to me would want me to perform sun-protective behaviours." and "Most people who are important to me would approve of me performing sun-protective behaviours." | |
| Perceived Behavioural Control | 4 | 1 (strongly disagree) to 7 (strongly agree) | "I have complete control over whether I perform sun-protective behaviours."; "It is mostly up to me whether I perform sun-protective behaviours."; "If I wanted to it would be easy for me to perform sun-protective behaviours."; "I am confident that I could perform sun-protective behaviours." | |
| Group Norms | 4 | 1 (strongly disagree) to 7 (strongly agree) 1 (none) to 7 (all) | "Most of my friends perform sun-protective behaviours." and "My friends think that performing sun-protective behaviours is a good thing to do." "How many of your friends would think that performing sun-protective behaviours every time you are out in the sun for more than 10 minutes in the next week is a good thing to do?" and "How many of your friends would perform sun-protective behaviours every time they are out in the sun for more than 10 minutes during the next week?" |
|
| Image Norms | 5 | 1 (strongly disagree) to 7 (strongly agree) | "Young celebrities and movie stars always seem to have a tan."; "I see more examples of models who have pale skin on TV and in magazines than I used to."; "I think that to be a successful movie star or TV star you should have a tan."; "It seems that society wants young people to have a tan."; "I can think of many young movie stars and TV stars who have pale skin." | |