Figure 4.
Relationship between the weighted mean age (in years) of examinees from 10 population–based studies belonging to different age groups and the observed prevalence (with 95% confidence intervals).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.