175 practices from five Danish counties participate in the ADDITION-DK. All 163,189 patients in these practices, aged 40-69 years were invited to take part in a stepwise screening program for diabetes.
The first step in the screening program was to complete a score questionnaire. People, who had a high screening score indicating increased risk for type 2 diabetes were requested to attend their general practitioners. Close to 28,000 people attended their doctor and got blood samples taken.
The ADDITION-DK includes randomised studies comparing routine treatment with more intensive treatment and cohort follow-up studies.