You are here: Home / Codebooks

Questionnaire Codebooks for Waves I, II, III and IV

Add Health Wave I, Wave II, Wave III and Wave IV instruments are available in codebook form. The codebooks contain the original questions, variable names, and response frequencies. The codebooks are pdf files compressed into ZIP files for faster downloading. After you have downloaded the files, use a decompression software to unzip them and Adobe Reader to view and print them.  Codebooks for all available Add Health restricted use datasets can be found here


For reference, index files (*ndx) list all the questions and corresponding variable names in eight of the Wave I, Wave II, Wave III, and Wave IV instruments. The index files are also pdfs compressed into ZIP files and require downloading and decompression.


Flowcharts provide a visual representation of the logic and skip patterns in the Wave IV survey instrument. Flowcharts are available for Wave IV only and should be used in conjunction with the Wave IV codebooks. All flowchart files are pdfs.

Section-Variable Lists

A shorter reference, section-variable lists provide the names of each section and the corresponding variable prefixes for each section in the Wave I, II, III and IV In-Home Interviews. The section-variable lists are not compressed; readers can view, print, or save from any browser.

User Guides and Documentation

Supplemental user guides and documentation can be found here.