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.
Total prevalence data for Trisomy 18 (1974–2015) from all registers (a) with complete data on LB, SB, and ETOPFA; (b) with data only on LB and SB. ETOPFA, elective termination of pregnancy for fetal anomalies; LB, live births; SB, stillbirths
