D80+ documentation

Upon the release of the data in the second quarter of 2023, the following documentation objects will be available for the D80+ study:

  • three survey instruments: the questionnaire, the CATI instrument for Module 1, and the CATI instrument for Module 2,
  • the codebook containing all variables included in the Scientific Use File (SUF), as well as the values and labels of the variables, and frequencies of valid and missing values,
  • the methodological report, which explains the sampling procedure, conduct of the survey, and data collection, and
  • the scaling handbook, which describes the process for constructing scores, scales, and generated variables.