American Journal of Epidemiology Vol. 124, No. 6: 986-993
Copyright © 1986 by The Johns Hopkins University School of Hygiene and Public Health
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EFFECT OF MARIJUANA USE IN PREGNANCY ON FETAL GROWTH
From the Perinatal Epidemiology Unit, and the Departments of Epidemiology and Public Health, and Obstetrics and Gynecology, Yale University Medical School New Haven, CT
Reprint requests to Dr. Michael B. Bracken, Department of Epidemiology and Public Health, Yale Medical School, 60 College Street, New Haven, CT 06510.
In a prospective study of 3,857 pregnancies ending in singleton live births at Yale-New Haven Hospital, New Haven, Connecticut, in 1980–1982,9.5% of mothers reported using marijuana (4.1% occasionally and 5.4% at least 2–3 times monthly). Among whtte women, regular use was associated with an increased risk of delivering a low birth weight (<2,500 gm) infant (odds ratio (OR) = 2.6, 95% confidence interval (CI) = 1.1–6.2) and small for gestational age infant (OR = 2.3, 95% CI = 1.3–4.1) after adjustment for other risk factors. Nonwhite marijuana users were not at further increased risk for delivering a low birth weight or small for gestational age infant beyond the elevated rates of these conditions already experienced by nonwhites in general. Marijuana use was also related to preterm delivery (gestational age <37 weeks from last menstrual period) in white women (OR = 1.9, 95% CI = 1.0–3.9) but not nonwhtte women. Occasional use was unrelated to the risk of low birth weight, small for gestational age, or preterm delivery.
birth weight; delivery; preterm; infant; small for gestational age; marijuana; pregnancy
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