A randomised controlled trial on the effect of My Health Check, a new interactive web-based decision tool, on the adoption of health preventive behaviours in volunteers aged 30-69 years.

We have developed a web-based decision aid (‘My Health Check’) for 30 to 69 year olds, based on both evidence and personal preferences. Users are asked to complete a questionnaire which includes questions about their age, gender, and health behaviours relevant to My Health Check (up to 10 depending on their age and gender). They are also asked to rate how difficult they would find each health-check activity. Then they are asked to indicate how important each of four attributes (factors determined by focus groups as important when making decisions about preventive health activities) are to them. My health check then displays a list of health behaviours, ranked from greatest potential for gain to least potential for gain. Completing the questionnaire and interactive components of the decision aid could take up to 45 minutes, although this time may vary depending upon the responses to the questionnaire and how many of the links the user clicks on and reads. It must be completed in one go, participants cannot leave it and return later.