Codes and Frequencies
ANGIPECEVC indicates whether the person has ever had chronic angina pectoris. 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 ANGIPECEVC) created from the pre-1997 condition records, see the User Note on Condition Records and Condition Variables.
Defining Angina Pectoris Records and Identifying Persons with Angina Pectoris
For all available years, persons who were asked a direct question about having angina pectoris and who have a chronic angina pectoris condition record are given a "Yes" code for ANGIPECEVC. Persons who were asked a direct question about angina pectoris but do not have a chronic angina pectoris record are given a code of "No." Persons who were not asked a direct question about angina pectoris, 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 angina pectoris record.
For 1972 and 1978, angina pectoris records were defined as those condition records with a code of "4130" ("Angina pectoris with hypertensive disease") or "4139" ("Angina pectoris without mention of hypertensive disease") in the variable DCICDCOD in the original NHIS public use files. These condition code values come from the International Classification of Diseases (ICD) Revision 8. Additionally, to be considered "chronic," angina pectoris condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.
Beginning in 1979, NHIS began using ICD Revision 9 to code conditions. For 1979 to 1996, angina pectoris records were defined as those condition records with any of the following codes in the variable DCICDCOD in the original public use files:
- "4130" ("Angina decubitus")
- "4131" ("Prinzmetal angina")
- "4139" ("Other and unspecified angina pectoris")
As with earlier years, to be considered "chronic," angina pectoris condition records for 1979-1996 must also have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.
For 1972, ANGIPECEVC should be weighted with PERWEIGHT.
For 1978 to 1996, ANGIPECEVC should be weighted with CONDWT5.
Related Angina Pectoris Variables
The nearest equivalent of ANGIPECEVC for 1997 forward is ANGIPECEV (Ever told had angina pectoris). However, researchers should use caution when comparing prevalence estimates derived from these two variables, as the manner of collecting information about angina pectoris differs greatly between the two. ANGIPECEVC 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. ANGIPECEV, by contrast, is based on a direct question about whether the person had the condition angina pectoris.
As with all of the person-level condition variables created by IHIS from condition records prior to 1997, the universe for ANGIPECEVC 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 angina pectoris. 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.
- 1972: All persons.
- 1978-1996: Persons living in 1/6 of households (who received Condition List 5).
- 1972, 1978-1996