Description

For sample adults age 18+ who have at least one functional activity limitation (FLANY), and for whom a vision problem or problem seeing was reported as a condition causing any functional activity limitation (FLVISION), FLVISIONY reports the duration, in years, of the vision problem or problem seeing.

Data on the duration of limiting vision problem or problem seeing were collected via the question, "How long have you had [a vision problem or problem seeing]?" Respondents could answer this open-ended question using the time unit of their choice (i.e., days, weeks, months, years, or since birth). The original responses to the question are reported in two complementary variables, FLVISIONTP (which specifies the time unit) and FLVISIONNO (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 (FLVISIONY) and groups of months (FLVISIONMO).

Comparability

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

Analysts can achieve comparability across all years by combining codes for values of 96 and above into a single "unknown" category.

Universe

Availability

• 1997-2018

Weights

• 1997-2018 : SAMPWEIGHT