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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/21594

Title: Small for gestational age and exposure to particulate air pollution in the early-life environment of twins
Authors: Bijnens, Esmee
Derom, Catherine
Gielen, Marij
Winckelmans, Ellen
Fierens, Frans
Vlietinck, Robert
Zeegers, Maurice P.
Nawrot, Tim S.
Issue Date: 2016
Citation: ENVIRONMENTAL RESEARCH, 148, p. 39-45
Abstract: Several studies in singletons have shown that maternal exposure to ambient air pollutants is associated with restricted fetal growth. About half of twins have low birth weight compared with six percent in singletons. So far, no studies have investigated maternal air pollution exposure in association with birth weight and small for gestational age in twins. We examined 4760 twins of the East Flanders Prospective Twins Survey (2002-2013), to study the association between in utero exposure to air pollution with birth weight and small for gestational age. Maternal particulate air pollution (PM10) and nitric dioxide (NO2) exposure was estimated using a spatial temporal interpolation method over various time windows during pregnancy. In the total group of twins, we observed that higher PM10 and NO2 exposure during the third trimester was significantly associated with a lower birth weight and higher risk of small for gestational age. However, the association was driven by moderate to late preterm twins (32-36 weeks of gestation). In these twins born between 32 and 36 weeks of gestation, birth weight decreased by 40.2 g (95% CI: -69.0 to -11.3; p=0.006) and by 27.3 g (95% CI: -52.9 to -1.7; p=0.04) in association for each 10 mu g/m(3) increment in PM10 and NO2 concentration during the third trimester. The corresponding odds ratio for small for gestational age were 1.68 (95% CI: 1.27-2.33; p=0.0003) and 1.51 (95% CI: 1.18-1.95; p=0.001) for PM10 or NO2, respectively. No associations between air pollution and birth weight or small for gestational age were observed among term born twins. Finally, in all twins, we found that for each 10 mu g/m(3) increase in PM10 during the last month of pregnancy the within-pair birth weight difference increased by 19.6 g (95% CI: 3.7-35.4; p=0.02). Assuming causality, an achievement of a 10 mu g/m(3) decrease of particulate air pollution may account for a reduction by 40% in small for gestational age, in twins born moderate to late preterm. (C) 2016 Elsevier Inc. All rights reserved.
Notes: [Bijnens, Esmee M.; Winckelmans, Ellen; Nawrot, Tim S.] Hasselt Univ, Ctr Environm Sci, Agoralaan Bldg D, B-3590 Diepenbeek, Belgium. [Bijnens, Esmee M.; Gielen, Marij; Zeegers, Maurice P.] Maastricht Univ, Dept Complex Genet, NUTRIM Sch Nutr & Translat Res Metab, Med Ctr, POB 616, NL-6200 MD Maastricht, Netherlands. [Derom, Catherine; Vlietinck, Robert] Univ Hosp Leuven, Ctr Human Genet, Herestr 49, B-3000 Leuven, Belgium. [Derom, Catherine] Ghent Univ Hosp, Dept Obstet & Gynaecol, B-9000 Ghent, Belgium. [Fierens, Frans] Belgian Interreg Environm Agcy, Kunstlaan 10-12, B-1210 Brussels, Belgium. [Nawrot, Tim S.] Leuven Univ KU Leuven, Dept Publ Hlth, Kapucijnenvoer 35, B-3000 Leuven, Belgium.
URI: http://hdl.handle.net/1942/21594
DOI: 10.1016/j.envres.2016.03.006
ISI #: 000376712800006
ISSN: 0013-9351
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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