Practices and problems in HANES. Dietary data methodology

Between April 1971 and June 1974, the first attempt to assess the nutritional status of the non-institutional population of the U.S. was carried out by the DHEW. The survey is known as "HANES" (U.S. Health and Nutrition Examination Survey). Preliminary findings have been released, and further data are expected to be available soon. In this report, dietary collection methods, training and evaluation of interviewers, types of data collected, and data processing procedures of the survey are described, as well as some of the problems encountered.