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STROKEVC
Had cerebral vascular accident, ever (Condition)
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Codes and Frequencies



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Description

STROKEVC indicates whether the person ever had a stroke. 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 STROKEVC) created from the pre-1997 condition records, see the User Note on Condition Records and Condition Variables.

Defining Stroke Records and Identifying Persons Who Had a Stroke

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

For persons with a "Yes" response, our coding further identifies the type of stroke as a hemorrhage, occlusion/thrombosis/embolism, or as ill-defined cerebrovascular disease.

1972 and 1978

For 1972 and 1978, stroke records were defined as those condition records with any of the following codes in the variable DCICDCOD in the original public use files:

 

Hemorrhage
  • "4310" or "4319" (Cerebral hemorrhage)
Occlusion/Thrombosis/Embolism
  • "4320" or "4329" (Occlusion of precerebral arteries)
  • "4330" or "4339" (Cerebral thrombosis)
  • "4340" or "4349" (Cerebral embolism)
Ill-defined Cerebrovascular Disease
  • "4360" or "4369" (Acute but ill-defined cerebrovascular disease)
  • "4370" or "4379" (Generalized ischemic cerebrovascular disease)

These condition code values come from the International Classification of Diseases (ICD) Revision 8. Additionally, to be considered "chronic," stroke records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

1979 to 1996

Beginning in 1979, NHIS began using ICD Revision 9 to code conditions. For 1979 to 1996, stroke records were defined as those condition records with any of the following codes in the variable DCICDCOD in the original public use files:

 

Hemorrhage
  • "4310" (Intracerebral hemorrhage)
  • "4320", "4321", or "4329" (Other and unspecified intracranial hemorrhage)
Occlusion/Thrombosis/Embolism
  • "4330", "4331", "4332", "4333", "4338", or "4339" (Occlusion and stenosis of precerebral arteries)
  • "4340", "4341", or "4349" (Occlusion of cerebral arteries)
Ill-defined Cerebrovascular Disease
  • "4360" (Acute but ill-defined cerebrovascular disease)
  • "4370" (Cerebral atherosclerosis)
  • "4371" (Other generalized ischemic cerebrovascular disease)
  • "4372" (Hypertensive encephalopathy)
  • "4373" (Cerebral aneurysm, nonruptured)
  • "4374" (Cerebral arteritis)
  • "4375" (Moyamoya disease)
  • "4376" (Nonpyogenic thrombosis of intracranial venous sinus)
  • "4377" (Transient global amnesia)
  • "4378" (Other, other and ill-defined cerebrovascular disease)
  • "4379" (Unspecified, other and ill-defined cerebrovascular disease)

As with earlier years, to be considered "chronic," stroke condition records must also have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

Weights
For 1972, STROKEVC should be weighted with PERWEIGHT.

For 1978 to 1996, STROKEVC should be weighted with CONDWT5.

Related Stroke Variables
The nearest equivalent of STROKEVC for 1997 forward is STROKEV (Ever told had stroke). However, researchers should use caution when comparing prevalence estimates derived from these two variables, as the manner of collecting information about strokes differs greatly between the two. STROKEVC was created by recoding condition records that were generated in response to several different survey questions about health problems underlying disability, sick days, or contacts with health care practitioners. STROKEV, by contrast, is based on a direct question about whether the person ever had a stroke.

Comparability

As with all of the person-level condition variables created by IHIS from condition records prior to 1997, the universe for STROKEVC 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 ever having a stroke. 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

  • 1972: All persons.
  • 1978-1996: Persons living in 1/6 of households (who received Condition List 5).

Availability

  • 1972, 1978-1996

Weights