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.
Heart rate variability in supine (solid boxes) and upright (striped boxes) positions: high-frequency power (A), low-frequency power (B), and low-frequency – high-frequency ratio (C) in tertiles of plasma parathyroid hormone concentration adjusted for sex; median (thick line inside box), 25th to 75th percentile (box), and range (whiskers, outliers omitted).
This work is licensed under a