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.
(A) Hypothetical determinants specific to a given pattern are shown in the same color as the corresponding curve, whereas those common to several patterns are shown in black.
(B) Separately provides the four age-dependent patterns.
