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.
Sex differences in fetal short-term HR variability (mean ± SE) between exposure groups (post hoc test significance levels: *p < 0.05, **p < 0.01, ***p < 0.001; *indicates within-sex group difference, ♦ indicates within-group sex difference).
