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Ever told had cystic fibrosis

Codes and Frequencies

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CYSTICFIEV reports whether the person has cystic fibrosis. Please see Comparability and Universe tabs for changes in universe and question wording between samples.


The Field Representative's Manual for 2001 forward defined Cystic Fibrosis as "an inherited disorder of the exocrine glands, affecting infants and children. Symptoms can include a distended abdomen, diarrhea, malnutrition, and repeated incidence of respiratory infections." This definition was not routinely shared with respondents.

In 1994 and 1995, this variable is part of the Disability Supplement (NHIS-D) that collects information on disability. NHIS-D included two household interviews: in Phase I all members of sample families were screened for any indication of disability; in Phase II persons with any indication of disability were followed-up for additional information. Phase I includes sensory, communication, and mobility problems; health conditions; activities of daily living and independent activities of daily living; functional limitations; mental health; services and benefits; special health needs of children; early child development; education; relationship to respondent; and perceived disability. Phase II includes four Disability Followback Survey (DFS) questionnaires: one for children, one for adults, one for elderly persons (69 years of age and over) without any indication of disability (also called the Supplement on Aging or SOA; only in 1994), and one for persons with a history of polio.


Changes in the universe between samples limit the comparability of this variable.

In 1994 and 1995, all persons in the National Health Interview Survey-Disability Survey (NHIS-D) Phase I sample are included in the universe. In those years, the household respondent was asked to identify any persons in the family who have cystic fibrosis.

From 1997 on, this question was asked only of sample children under age 18. The household respondent was asked if he or she had ever been told by a doctor or health professional that the sample child had cystic fibrosis.


  • 1994-1995: Persons in the NHIS-D Phase I sample.
  • 1997-2018: Sample children under age 18.


  • 1994-1995, 1997-2018