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Description

DISCPROBYRC indicates whether the person had a chronic slipped or ruptured disc 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 DISCPROBYRC) created from the pre-1997 condition records, see the User Note on Condition Records and Condition Variables.

Defining Slipped/Ruptured Disc Records and Identifying Persons with a Slipped or Ruptured Disc

For all available years, persons who were asked a direct question about having a slipped or ruptured disc and who have a chronic slipped or ruptured disc condition record are given a "Yes" code for DISCPROBYRC. Persons who were asked a direct question about a slipped or ruptured disc but do not have a chronic slipped or ruptured disc record are given a code of "No." Persons who were not asked a direct question about a slipped or ruptured disc, 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 slipped or ruptured disc record.

For 1969, 1976, and 1978-1981, slipped or ruptured disc records were defined as those condition records with a code of "214" ("Displacement of intervertebral disc") in the variable DIAGR1 in the original NHIS public use files. These condition code values come from NCHS's Diagnostic Recode #1: Diseases, Injuries, and Impairments, not from the International Classification of Diseases (ICD) codes. Additionally, to be considered "chronic," slipped or ruptured disc condition records must have a code of "1" ("Chronic") in the variable CONDCODE (1969) or the variable CACODE (1976 and later) in the original NHIS public use files.

For 1982 to 1996, chronic slipped or ruptured disc records were defined as those condition records with a code of "105" ("Intervertebral disc disorders") 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 1969 and 1976, DISCPROBYRC should be weighted with PERWEIGHT.

For 1978 to 1981, DISCPROBYRC should be weighted with CONDWT2.

For 1982 to 1996, DISCPROBYRC should be weighted with CONDWT1.

Comparability

As with all of the person-level condition variables created by IHIS from condition records prior to 1997, the universe for DISCPROBYRC 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 slipped or ruptured disc in the past year. There is also a minor universe change between the sets of years 1978-1981 and 1982-1996. These changes require 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
• 1982-1996 : CONDWT1
• 1978-1981 : CONDWT2