Description

PLEURISYRC indicates whether the person had chronic pleurisy 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 PLEURISYRC) created from the pre-1997 condition records, see the User Note on Condition Records and Condition Variables.

Defining Pleurisy Records and Identifying Persons with Pleurisy

For all available years, persons who were asked a direct question about pleurisy and who have a chronic pleurisy condition record are given a "Yes" code for PLEURISYRC. Persons who were asked a direct question about pleurisy but do not have a chronic pleurisy record are given a code of "No." Persons who were not asked a direct question about pleurisy, 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 pleurisy record.

For 1970 and 1978, pleurisy records were defined as those condition records with a code of "5110" through "5119" ("pleurisy") in the variable DCICDCOD in the original NHIS public use files. This condition code value comes from the International Classification of Diseases (ICD), Revision 8. Additionally, to be considered "chronic," pleurisy condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

For 1979-1981, pleurisy records were defined as those condition records with a code of "5110" through "5119" ("pleurisy") in the variable DCICDCOD in the original NHIS public use files. This condition code value comes from the International Classification of Diseases (ICD), Revision 9. As with earlier years, to be considered "chronic," pleurisy condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

For 1982-1996, chronic pleurisy records were defined as those condition records with a code of "610" ("Pleurisy") in the variable C1CONDRC in the original NHIS public use files. This condition code value comes from NCHS's Diagnostic Recode C: Chronic Conditions and Impairments.

Comparability

As with all of the person-level condition variables created by IHIS from condition records prior to 1997, the universe for PLEURISYRC 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 pleurisy in the past year. This change requires that different weight variables be used depending on which years of data are analyzed. See the "Weights" 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

• 1970, 1978-1996

Weights

• 1970 : PERWEIGHT
• 1978-1996 : CONDWT6