There are three codebooks, one each for the primary NAWSPAD file, the NIOSH file, and the EPA file.  These files are described in the subtopic Public Data Content and File Formats.

The NAWSPAD codebook includes the number of observations for each response code by two-year period (i.e., 1989-1990, 1991-1992, etc., through 2017- 2018).  Variables in the NAWSPAD codebook match the FY 2018 questionnaire.

The NIOSH codebook includes the annual number of observations to occupational mental health questions that were administered in fiscal years 2009 and 2010, by response category.  Variables in the NIOSH codebook match the FY 2010 questionnaire.

The EPA codebook contains the annual number of observations to the EPA supplemental questions on hygiene and clothes laundering practices that were administered in fiscal years 2013 and 2014, by response category.  Variables in the EPA codebook match the FY 2014 questionnaire.
English and Spanish versions of the above referenced questionnaires, in hard copy and electronic format, can be obtained by contacting Daniel Carroll, Office of Policy Development and Research, Employment and Training Administration, U.S. Department of Labor, 200 Constitution Avenue, N.W., Room N-5641, Washington, D.C. 20210; e-mail: carroll.daniel.j@dol.gov; phone: (202) 693-2795.

Data users should review the above referenced codebooks and questionnaires prior to analyzing data.