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Table 1 Primary and secondary outcome measures

From: Study protocol: a randomised controlled trial of a theory-based online intervention to improve sun safety among Australian adults

Variable Number of items Scale Measurement strategies
Primary outcome variables   
Intentions 3 1 (strongly disagree) to 7 (strongly agree) “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. On average, how often did you perform sun-protective behaviours on Saturday and Sunday?”; “Think about the past week. On average, how often did you perform sun-protective behaviours on a typical week day?”
Secondary outcome variables   
Attitudes 6 1 (pleasant) to 7 (unpleasant) “Performing sun-protective behaviours every time I go in the sun for more than 10 minutes during the next week, would be…” (reverse scored)
1 (good) to 7 (bad)
1 (wise) to 7 (unwise)
1 (easy) to 7 (difficult)
1 (nice) to 7 (awful)
1 (positive) to 7 (negative)
Subjective Norms 3 1 (strongly disagree) to 7 (strongly agree) “Those people who are important to me would want me to perform sun-protective behaviours.”; “Most people who are important to me would approve of me performing sun-protective behaviours.”; “Most people who are important to me would think that I should perform sun safe 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) “Most of my friends perform sun-protective behaviours.”; “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?”; “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?”
1 (none) to 7 (all)  
Personal Norms 2 1 (strongly disagree) to 7 (strongly agree) “I think I should perform sun safe behaviours.”; “Performing sun safe behaviours is something I should do.”
Image Norms 5 1 (strongly disagree) to 7 (strongly agree) “Celebrities and movie stars always seem to have a tan.”; “I see more examples of models who do not have a tan on TV and in magazines than I used to.” (reverse scored); “I think that to be a successful movie star or TV star you should have a tan.”; “It seems that society wants people to have a tan.”; “I can think of many movie stars and TV stars who do not have a tan” (reverse scored).
Tanning 2 1 (strongly disagree) to 7 (strongly agree) “A person with a tan looks Australian”; “A person without a tan looks ‘Un-Australian”.
Responsibility 3 1 (strongly disagree) to 7 (strongly agree) “I think it is my responsibility to perform sun safe behaviours”; “I think it is up to the government to ensure that sun safety measures are available” (reverse scored); “It is my personal choice to perform sun safe behaviours”.