Plan of procedures
The RACK Study is a screening study in which participants take part in blood pressure and cholesterol level screenings. It is a longitudinal study which takes place in Seoul, South Korea. There are two times of measurement with an interval of about six months between them. The first measurement wave took place in 2004, data from the second wave are still being collected. At each time of measurement, participants completed the following procedure. The third questionnaire was filled in at home and sent back to the researchers by mail. Additionally, a control group is included in the study. Participants in this group do not take part in the screening but just fill in a questionnaire.