Description

For persons under age 18 who have at least one activity limitation (LANY), and for whom either attention deficit disorder (ADD) or attention deficit hyperactivity disorder (ADHD) was reported as a condition causing any activity limitation (CLIMADD), CLIMADDNO reports the number of time units which the respondent stated when reporting the duration of ADD or ADHD.

Data on the duration of limiting ADD/ADHD were collected via the question, "How long [have/has] [you/person] had [ADD/ADHD]?" 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, CLIMADDTP (which specifies the time unit) and CLIMADDNO (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 (CLIMADDY) and groups of months (CLIMADDMO).

Comparability

The variable is completely comparable across time.

Universe

Availability

• 2001-2018

Weights

• 2001-2018 : PERWEIGHT