The authors studied the effects and population-level impact of short (<=12 months) interpregnancy intervals on the risks for low (<2.5 kg) birth weight and preterm (<37 weeks) delivery of livebom singleton infants to US African American, Mexican, Native American, non-Hispanic white, and Puerto Rican mothers (n=4,841,418) from 1989 to 1991.
Statistical analyses were done by using the Mantel-Haenszel correlation statistic chisquare test and logistic regression.
The proportion of livebirths associated with <=12-month interpregnancy intervals was the lowest among non-Hispanic whites (18.5%, 95% confidence interval 18.5-18.5) and the highest among Native Americans (29.7%, 95% confidence interval 29.2-30.2).
As compared with mothers with>12-month intervals, mothers with<6-month intervals had an approximately 50% to 80% increased risk of very low (<1.5 kg) birth weight delivery and a 30% to 90% increased risk of very preterm (<32 weeks) delivery.
Logistic regression analyses showed that the adverse effects of short intervals were reduced by about 10% but remained for the most part significant after controlling for potential confounding by maternal age, education, parity, marital status, prenatal care, smoking, and previous preterm delivery.
Mots-clés Pascal : Prématurité, Poids naissance faible, Intervalle, Gestation, Faible, Ethnie, Epidémiologie, Facteur risque, Nouveau né, Homme, Etats Unis, Amérique du Nord, Amérique, Gestation pathologie, Nouveau né pathologie
Mots-clés Pascal anglais : Prematurity, Low birth weight, Interval, Pregnancy, Low, Ethnic group, Epidemiology, Risk factor, Newborn, Human, United States, North America, America, Pregnancy disorders, Newborn diseases
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0531917
Code Inist : 002B20F02. Création : 23/03/1999.