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.
Age, period, and cohort effect of the rate ratio (RR) of obesity by sex group, for boys (A–C) and girls (D–F). (A,D): age effect; (B,E): period effect; (C,F): cohort effect. Results are RR (solid line) and 95% confidence interval (dotted line). The solid horizontal line represents RR = 1.
