Description

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

Defining Laryngitis Records and Identifying Persons with Laryngitis

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

For 1970 and 1978, chronic laryngitis records were defined as those condition records with a code of "506" ("Chronic laryngitis") in the variable DCICDCOD in the original NHIS public use files. This condition code value comes from the International Classification of Diseases (ICD) codes, Revision 8. Additionally, to be considered "chronic," laryngitis condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

For 1979 to 1981, chronic laryngitis records were defined as those condition records with a code of "4760" ("Chronic laryngitis") or "4761" ("Chronic laryngotracheitis") in the variable DCICDCOD in the original NHIS public use files. These condition code values come from the International Classification of Diseases (ICD) codes, Revision 9. As with earlier years, to be considered "chronic," laryngitis condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.

For 1982-1996, chronic laryngitis records were defined as those condition records with a code of "608" ("Chronic laryngitis") in the variable C1CONDRC in the original NHIS public use files.

Weights
For 1970, LARYCHRONYRC should be weighted with PERWEIGHT.

For 1978 to 1983, LARYCHRONYRC 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 LARYCHRONYRC 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 laryngitis 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