Description

CORNSYRC indicates whether the person had chronic bunions, corns, or calluses 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 CORNSYRC) created from the pre-1997 condition records, see the User Note on Condition Records and Condition Variables.

Defining Bunion/Corn/Callus Records and Identifying Persons with Bunions, Corns, or Calluses

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

For 1969, 1976, and 1978-1981, bunions, corns, or calluses records were defined as those condition records with either a code of "217" ("Bunion") in the variable DIAGR1 or a code of "700" ("Corns and callosities") in the variable DIAGCODE (1969) or DCICDCOD (1976 and later years) in the original NHIS public use files. These condition code values come from NCHS's Diagnostic Recode #1: Diseases, Injuries, and Impairments and from the International Classification of Diseases (ICD) codes, respectively. Additionally, to be considered "chronic," bunion, corn, or callus 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 bunion, corn, or callus records were defined as those condition records with a code of "108" ("Bunion") or a code of "117" ("Corns and calluses") 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, CORNSYRC should be weighted with PERWEIGHT.

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

For 1982 to 1996, CORNSYRC 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 CORNSYRC 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 bunions, corns, or calluses 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