See menu on the right to find variables and codebooks by category. Within each category, the variables are grouped by topic.
Explanation of the codebook tables
Variable Name: name of the variable as used in the NEO database
Label: description of the variable
Format / Categories: describes the format of the variable (e.g. string, numeric, date). In case of a categorical numeric variable, it is described as “Cat /” + the value labels of the individual categories.
Source: source of the variable, i.e., how the data was collected. For example, ‘GenQ’ = general questionnaire that was completed at home. Also see this page for a complete list of baseline data collection methods.