For the 2009 survey within the framework of the PREFER I study, the following documentation is available:
- Instrument documentation PREFER I with the survey documents of the three points of measurement and a brief explanation of the study design. The CAPI template also contains the corresponding SUF variables. For reasons of data protection, selected variables are not available in the Scientific Use File (for example, the date of birth).
- Codebook of the Scientific Use File of the PREFER I survey. The codebook contains all variables with their positions, values, formats and labels as well as the frequencies.