title: High caffeine consumption in the third trimester of pregnancy: gender-specific effects on fetal growth.
abstract: It has been suggested that a high caffeine intake in pregnancy may be a risk factor for fetal growth retardation. We have tested this hypothesis in a population-based case-control study. Caffeine intake among 111 mothers of small-for-gestational-age (SGA) infants (56 boys, 55 girls) was compared with the intake among 747 mothers of non-SGA infants (368 boys, 379 girls). Food records for 3 days were collected in the second (week 17-20) and in the third (week 33) trimester, and caffeine intake from coffee, tea, soft drinks and chocolate was calculated and dichotomised as low or high, based upon the median value. Mothers of SGA infants had higher mean intake of caffeine [281 +/- 210 (SD) mg/day] in the third trimester than mothers of non-SGA infants (212 +/- 150 mg/day; P < 0.001). The risk of SGA birth was nearly doubled if the mother had a high rather than a low caffeine intake in the third trimester [odds ratio (OR) 1.8; 95% confidence intervals (CI) 1.2, 2.5]. The increased risk was mainly found in boys (OR 2.8; 95% CI 1.5, 5.2), and not in girls (OR 1.2; 95% CI 0.7, 2.1). The increased risk for boys persisted after adjustment for cigarette smoking alone, or for smoking and various other SGA risk factors together. Our results suggest that a high caffeine intake in the third trimester may be a risk factor for fetal growth retardation, in particular if the fetus is a boy.
authors: Department of Community Medicine and General Practice, Medical Faculty, Norwegian University of Science and Technology, Trondheim, Norway. torstein.vik@medisin.ntnu.no
authors: Torstein
authors: T
authors: Vik
authors: Leiv S
authors: LS
authors: Bakketeig
authors: Kerstin Ulla
authors: KU
authors: Trygg
authors: Kari
authors: K
authors: Lund-Larsen
authors: Geir
authors: G
authors: Jacobsen
mesh_terms: D000328:Adult; D001628:Beverages / Q000009:adverse effects*; D002110:Caffeine / Q000008:administration & dosage / Q000009:adverse effects*; D016022:Case-Control Studies; D005260:Female; D005317:Fetal Growth Retardation / Q000139:chemically induced*; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D008297:Male; D008431:Maternal-Fetal Exchange; D016017:Odds Ratio; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D012307:Risk Factors; D012737:Sex Factors
chemical_list: D002110:Caffeine