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.
Change in z-score from birth for each site. Change in z-score from birth to 4 weeks (A) and 36 weeks’ corrected age (B) for each site, adjusted for site, sex, gestational age at birth and birthweight z-score. Data are median and interquartile range. Expected growth (z-score change >−0.8 to <0.8) is indicated by the grey shaded area. CA, corrected age.
