Table 1.

Memory severity impairment using NHANES 2011–2014 memory question

During the past 7 days, how often have you had trouble remembering where you put things like keys or wallet?	Memory impairment classification
Never	Never
About once	Early stage
2 or 3 times
Nearly everyday	Late stage
Several times a day
Refused	Refused
Don't know	Don't know

Abbreviation: NHANES, National Health and Nutrition Examination Survey.