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.
Maternal weight gain during pregnancy (in tertiles) relates directly and maternal prepregnant body mass index (BMI; in tertiles) relates inversely to the prevalence of childhood asthma. The P values are based on chi-square and Fisher exact test.
