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.
Ab levels to Wb123 in children ≤11 years old by 2 year age divisions in 1975 (red dots) and 1992 (blue dots). Each dot represents a single individual and the black bars represent the geometric means for each group. The shaded grey area indicates values considered negative and p-values were calculated using the Mann Whitney U test.
