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Original Investigation
Feb 25, 2013

Micronutrient Supplementation and Pregnancy Outcomes: Double-Blind Randomized Controlled Trial in China

Author Affiliations

Author Affiliations: Institute of Reproductive and Child Health/Ministry of Health Key Laboratory of Reproductive Health and Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China (Drs Liu, Ye, and Ren); and Division of Nutrition, Physical Activity, and Obesity, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia (Drs Mei, Serdula, and Cogswell).

JAMA Intern Med. 2013;173(4):276-282. doi:10.1001/jamainternmed.2013.1632
Abstract

Background Beyond perinatal folic acid supplementation, the need for additional prenatal prophylaxis of iron with or without other micronutrients remains unclear. We aim to investigate the maternal and infant health effects of iron plus folic acid and multiple micronutrient supplements vs folic acid alone when provided to pregnant women with no or mild anemia.

Methods In this randomized double-blind controlled trial, 18 775 nulliparous pregnant women with mild or no anemia were enrolled from 5 counties of northern China from May 2006 through April 2009. Women were randomly assigned to daily folic acid (400 μg) (control), folic acid–iron (30 mg), or folic acid, iron, and 13 additional vitamins and minerals provided before 20 weeks gestation to delivery. Primary outcome was perinatal mortality. Secondary outcomes included neonatal and infant mortality, preterm delivery, birth weight, birth length, gestational duration, and maternal hemoglobin concentration and anemia.

Results A total of 92.7% of women consumed 80% to 100% of supplements as instructed. On average, women consumed 177 supplements. Compared with daily prenatal folic acid, supplementation with iron–folic acid with or without other micronutrients did not affect the rate of perinatal mortality (8.8, 8.7, and 8.3, respectively) per 1000 births, and relative risks (RRs) were 1.00 (95% CI, 0.68-1.46; P = .99) and 0.94 (95% CI, 0.64-1.39; P = .76), respectively. Risk of other adverse maternal and infant outcomes also did not differ, except that RRs for third-trimester maternal anemia were 0.72 (95% CI, 0.63-0.83; P < .001) and 0.71 (95% CI, 0.62-0.82; P < .001), respectively.

Conclusion Prenatal iron–folic acid and other micronutrient supplements provided to Chinese women with no or mild anemia prevented later pregnancy anemia beyond any benefit conferred by folic acid alone but did not affect perinatal mortality or other infant outcomes.

Trial Registration clinicaltrials.gov Identifier: NCT00133744

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