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: odds ratios (OR) for stillbirths according to maternal hemoglobin levels in populations at sea level and at high altitude combined. B: OR for preterm births according to maternal hemoglobin levels in populations at sea level and at high altitude. C: OR for small for gestational age according to maternal hemoglobin levels in populations at sea level and at high altitude combined.
