Description

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

Defining Tuberculosis Records and Identifying Persons with Tuberculosis

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

For 1970 and 1978-1981, chronic tuberculosis records were defined as those condition records with a code of "1" ("Tuberculosis, active") or "2" ("Tuberculosis, arrested or inactive") in the variable DIAGR3 in the original NHIS public use files. This condition code value comes from NCHS's Diagnostic Recode #3: Chronic Diseases and Impairments.

For 1982-1996, chronic tuberculosis records were defined as those condition records with a code of "612" ("Tuberculosis [pulmonary]") 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.

Weights
For 1970, TBYRC should be weighted with PERWEIGHT.

For 1978 to 1996, TBYRC should be weighted with CONDWT6.

Comparability

As with all of the person-level condition variables created by IHIS from condition records prior to 1997, the universe for TBYRC 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 tuberculosis 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

• 1970, 1978-1996

Weights

• 1970 : PERWEIGHT
• 1978-1996 : CONDWT6