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.
Estimated mean birthweight z‐score by interpregnancy interval category, before and after adjusting for maternal age at last delivery, parity, smoking at time of conception, last pregnancy stillbirth or neonatal death, occupation, can raise 5000 NOK in 1 wk, rating of own/family wealth, pregnancy intention
