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Duration of limiting learning disability: Number of units

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For persons under age 18 who have at least one activity limitation (LANY), and for whom a learning disability was reported as a condition causing any activity limitation (CLIMLEARN), CLIMLEARNNO reports the number of time units which the respondent stated when reporting the duration of the learning disability.

Data on the duration of limiting learning disability were collected via the question, "How long [have/has] [you/person] had [a learning disability]?" Respondents could answer this open-ended question using the time unit of their choice (i.e., days, weeks, months, year, or since birth). The original responses to the question are reported in two complementary variables, CLIMLEARNTP (which specifies the time unit) and CLIMLEARNNO (which, as noted above, 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 (CLIMLEARNY) and groups of months (CLIMLEARNMO).


The variable is completely comparable across time.


  • 2001-2013; 2014 2015 2016 2017 2018: Persons under age 18 limited due to learning disability.


  • 2001-2018