The study Health Behavior among Estonian Adult Population has been conducted every two years since 1990. A sample of 5,000 Estonian residents ages 16-64 years were selected from the Population Register and were sent a survey questionnaire through the mail. Additionally, county samples were included (n=7400) to analyze health indicators for the 15 counties and two largest city divisions in Estonia.

The questionnaire collected information on the participants' health status, use of health services and medications, physical activity, smoking and alcohol use, dietary habits, and demographic information.