Description

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

Defining Lumbago Records and Identifying Persons with Lumbago

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

For 1969, 1976, and 1978, lumbago records were defined as those condition records with a code of "7170" ("Lumbago") in the variables DIAGCODE (1969) or DCICDCOD (1976 and 1978) 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," lumbago condition records must have a code of "1" ("Chronic") in the variables CONDCODE (1969) or CACODE (1976 and 1978) in the original NHIS public use files.

For 1979 to 1996, chronic lumbago records were defined as those condition records with a code of "7242" ("Lumbago") in the variable DCICDCOD in the original NHIS public use files. This condition code values come from ICD Revision 9. As with earlier years, to be considered "chronic," lumbago condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

Weights
For 1969 and 1976, LUMBAGOYRC should be weighted with PERWEIGHT.

For 1978 to 1996, LUMBAGOYRC should be weighted with CONDWT2.

Comparability

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

• 1969, 1976, 1978-1996

Weights

• 1969, 1976 : PERWEIGHT
• 1978-1996 : CONDWT2