Description

PANCDISYRC indicates whether the person had any chronic disease of the pancreas in the past year. This variable is created with supplemental programming by the IPUMS NHIS staff from the pre-1997 condition records. For general information about IHIS variables (such as ASTHMAYRC) created from the pre-1997 condition records, see the User Note on Condition Records and Condition Variables.

Defining Pancreatic Disease Records and Identifying Persons with Pancreatic Disease

For all available years, persons who were asked a direct question about pancreatic disease and who have a chronic pancreatic disease condition record are given a "Yes" code for PANCDISYRC. Persons who were asked a direct question about pancreatic disease but do not have a chronic pancreatic disease record are given a code of "No." Persons who were not asked a direct question about pancreatic disease, or for whom it is unknown whether they were asked such a question, are given a code of "NIU" (not in universe), regardless of whether they have a chronic pancreatic disease record.

For 1975 and 1978, pancreatic disease records were defined as those condition records with a code of "1570" through "1579" ("Malignant neoplasm of pancreas"), "2116" ("Benign neoplasm of pancreas"), "2306" ("Neoplasm of unspecified nature of pancreas"), or "5770" through "5779" ("Diseases of pancreas") in the variable DCICDCOD in the original NHIS public use files. These condition code values come from the International Classification of Diseases (ICD), Revision 8. Additionally, to be considered "chronic," condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

For 1979 to 1996, pancreatic disease records were defined as those condition records with a code of "1570" through "1579" ("Malignant neoplasm of pancreas"), "2116" ("Benign neoplasm of pancreas, except islets of Langerhans"), "2117" ("Benign neoplasm of islets of Langerhans"), or "5770" through "5779" ("Diseases of pancreas") in the variable DCICDCOD in the original NHIS public use files. These condition code values come from the International Classification of Diseases (ICD), Revision 9. As with earlier years, to be considered "chronic," condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

Comparability

As with all of the person-level condition variables created by IHIS from condition records prior to 1997, the universe for PANCDISYRC is substantially different for 1978 forward than it is for years prior to 1978. Beginning in 1978, only persons living in 1/6 of households, rather than all persons, were asked a direct question about having a disease of the pancreas in the past year. This change requires that different weight variables be used depending on which years of data are analyzed. See the "Description" tab for details.

Additionally, there is a change in the way "Yes" responses are coded over time. See the User Note on Condition Records and Condition Variables for details about the composite coding scheme employed by IHIS.

Universe

Availability

• 1975, 1978-1996

Weights

• 1975 : PERWEIGHT
• 1978-1996 : CONDWT1