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.
Mean age at pubertal onset by Tanner measure and birth cohort, for HIV-infected youth (unshaded bars) and HIV-exposed uninfected youth (shaded bars). P-values for statistical significance based on interval-censored models for the effect of HIV infection status fit separately within each birth cohort.
