Data Resource Center
Code library
National Health and Nutrition Examination Survey (NHANES)
Crosswalks of variable names and codes between NHANES survey cycles
Oral health questions in NHANES 1988-1994, 1999-2000 and 2001-2002
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Home Interview (Dry mouth, dental visits, dental health perception) |
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Releases in which variable appears and data set name |
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Variable name |
Variable Description or label |
1999-2000 |
2001-2002 |
2003-2004 |
2005-2006 |
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OHQ010 |
General Condition of Mouth and teeth |
OHQ |
OHQ_B |
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OHQ020 |
Limit foods because of teeth problems |
OHQ |
OHQ_B |
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OHQ030 |
When did you last visit a dentist (skip pattern) |
OHQ |
OHQ_B |
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OHQ033 |
What was the main reason you/SP last visited the dentist (skip pattern) |
OHQ |
OHQ_B |
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OHQ040 |
Routine check-ups over past 3 years (skip pattern) |
OHQ |
OHQ_B |
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OHQ050 |
Routine check-ups frequency over past 3 years (skip pattern) |
OHQ |
OHQ_B |
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OHQ060 |
Regular dentist/lab you visit for care(skip pattern) |
OHQ |
OHQ_B |
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OHQ070Q |
How long use this dentist/lab as regular - number |
OHQ |
OHQ_B |
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OHQ070U |
How long use this dentist/lab as regular – Units for number |
OHQ |
OHQ_B |
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OHQ080 |
Sip liquids to aid swallowing foods (ages 40+ years) |
OHQ |
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OHQ085 |
Sip liquids to aid swallowing foods (ages 18+ years) |
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OHQ_B |
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OHQ090 |
Amount of saliva in mouth (ages 40+ years) |
OHQ |
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OHQ095 |
Amount of saliva in mouth (ages 18+ years) |
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OHQ_B |
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OHQ100 |
Difficulties swallowing food (ages 40+ years) |
OHQ |
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OHQ105 |
Difficulties swallowing food (ages 18+ years) |
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OHQ_B |
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OHQ110 |
Mouth feel dry when eating meal (ages 40+ years) |
OHQ |
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OHQ115 |
Mouth feel dry when eating meal (ages 18+ years) |
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OHQ_B |
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General condition of (mouth and) teeth (OHQ010X)
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Data Release |
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NHANES 1988-1994 |
NHANES 1999-2002 |
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Variable name |
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HAQ1 Describe condition of natural teeth |
OHQ010 Describe condition of mouth and teeth (include false teeth and dentures) |
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Codes |
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01=Excellent |
No category for Excellent |
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02=Very Good |
1=Very Good |
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03=Good |
2=Good |
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04=Fair |
3=Fair |
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05=Poor |
4=Poor |
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06=Has no natural teeth |
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88=Blank but applicable |
7=refused |
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99=Don’t know |
9=Don’t know |
The category “Excellent” was included in NHANES 1988-1994 but not in NHANES 1999-2002. The programs for the MMWR Surveillance Summary create a variable OHQ010X for both NHANES, collapsing the “Excellent” and “Very Good” categories into one category labeled “Very good”, parallel to the NHANES 1999-2002 variable. (see programs nh3ques.sas and ohdques.sas)
However, the variable is not perfectly comparable between the two surveys. Analyses limiting the population to dentate participants may reduce the impact of the wording change on results.
Last dental visit (lastden, lastdenA)
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Data Release |
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NHANES 1988-1994 |
NHANES 1999-2002 |
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Variable name |
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HAQ3S Time since last visited dentist/hygienist in days |
OHQ030 How long since last visited the dentist |
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Codes |
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Time in days |
1=6 months or less |
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2=more than 6 months but not more than a year ago |
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3=more than 1 year, but not more than 2 years ago |
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4=more than 2 years but not more than 3 years ago |
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5=more than 3 years but not more than 5 years ago |
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6=more than 5 years ago |
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00000=none/never |
7=never have been |
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88888=Blank but applicable |
77=refused |
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99999=Don’t know |
99=Don’t know |
Variables lastden and lastdenA were constructed from these variables in the programs (nh3ques.sas and ohdques.sas).
These variables have 4 categories:
1 = 1 year ago or less
2 = 2 years ago or less
3 = more than 2 years ago, but not “Never”
4 = Never
Lastden treats special codes 88888,99999,77 and 99 as missing data.
LastdenA groups codes 99999 and 99 for Don’t know with category 3 = more than 2 years ago, but not "Never". The rationale is that participants who respond “Don’t know” have had a dental visit at some point, probably longer than 2 years ago, but are not sure when it was.