Fig. 3.
Item-pair mean difference scores within each age group (three left panels), and subject means by age group (right panel). Error bars for subject means represent bootstrapped nonparametric 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.