NAWS data are limited because the NAWS sampling universe does not include:
Persons employed at eligible establishments who do not perform crop-related work, such as secretaries or mechanics, unless such workers also perform crop-related work; and
Crop workers with a H-2A visa (a temporary-employment visa for foreign agricultural workers).
The NAWS interviews farm workers who are currently working in agriculture. Farm workers who have been out of work for over a year are not included in the sampling frame.
Except for California, the data are not available at the state level.
The health condition variables report diagnoses over the life of the respondent and may not represent health conditions at the time of interview. Work-relatedness was not assessed for the health conditions.