Germany National Health Interview and Examination Survey 1997-1999. Data must be requested from the agency. examined the health of the adult population in Germany. Information was gathered from 7,124 people, ages 18-79 years, living in private households. Institutionalized populations and individuals whose German language abilities were not strong enough to understand the questionnaires were excluded. In addition to the core survey, there were modules on drug use (prescription and over-the-counter), diet, folic acid intake, mental health, and the environment. Survey instruments included written questionnaires, personal and computerized interviews, a medical examination, and laboratory tests. Willing BGS98 participants were contacted for a follow-up survey from 2008-2011.
