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Duration of limiting other developmental problem: Years

Codes and Frequencies

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CLIMOTHDEVY reports the duration, in years, of a limiting (non-mental retardation) developmental problem. This information is reported only for persons who had at least one activity limitation (LANY), and whose limitation was due to a (non-mental retardation) developmental problem not listed on the interviewer-provided flashcard (CLIMOTHDEV).

Data on the duration of the limiting (non-mental retardation) developmental problem were collected via the question, "How long [have/has] [you/person] had [a (non-mental retardation) developmental problem]?" Respondents could answer this open-ended question using the time unit of their choice (i.e., days, weeks, months, or years). The original responses to the question are reported in two complementary variables, CLIMOTHDEVTP (which specifies the time unit) and CLIMOTHDEVNO (which reports the number of such units). For the NHIS public use files, the National Center for Health Statistics (NCHS) recoded the results from these two variables to create two other variables using standard time units: years (CLIMOTHDEVY) and groups of months (CLIMOTHDEVMO).


Apart from a change in the coding of "unknown" cases, this variable is comparable across years.


In 2002 forward, the unknowns were categorized as:

  • Unknown number of years (IPUMS NHIS code 96)
  • Unknown-refused (IHIS code 97)
  • Unknown-not ascertained (IHIS code 98)
  • Unknown-don't know (IHIS code 99)

However, in 1997-2001, the category of "Unknown number of years" did not occur.

Analysts can achieve comparability across all years by combining two-digit codes for 96 forward into a single "unknown" category.


  • 1997-2018: Persons limited due to other (non-mental retardation) developmental problem.


  • 1997-2018