Small for gestational age and exposure to particulate air pollution in the early-life environment of twins

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...

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Bibliographic Details
Published in:Environmental research 2016-07, Vol.148, p.39-45
Main Authors: Bijnens, Esmée M., Derom, Catherine, Gielen, Marij, Winckelmans, Ellen, Fierens, Frans, Vlietinck, Robert, Zeegers, Maurice P., Nawrot, Tim S.
Format: Article
Language:English
Subjects:
Adult
Air Pollutants - analysis
Air pollution
Air Pollution - analysis
Belgium - epidemiology
Birth Weight
Female
Gestational Age
Humans
Male
Maternal Exposure
Nitrogen Dioxide - analysis
Particulate matter
Particulate Matter - analysis
Pregnancy
Small for gestational age
Twin
Twins
Young Adult
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Summary: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 40.2g (95% CI: −69.0 to −11.3; p=0.006) and by 27.3g (95% CI: −52.9 to −1.7; p=0.04) in association for each 10µg/m³ 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 10µg/m³ increase in PM10 during the last month of pregnancy the within-pair birth weight difference increased by 19.6g (95% CI: 3.7–35.4; p=0.02). Assuming causality, an achievement of a 10µg/m³ decrease of particulate air pollution may account for a reduction by 40% in small for gestational age, in twins born moderate to late preterm. •Exposure to air pollution is associated with restricted fetal growth in singletons.•No studies have investigated the association of air pollution with birth weight and small for gestational age in twins.•Maternal air pollution (PM10 and NO2) exposure was estimated over various time windows during pregnancy in 4,760 twins.•Air pollution is associated with small for gestational age and birth weight in moderate to late preterm born twins.•The within-pair difference in birth weight increases with higher air pollution
ISSN:0013-9351
1096-0953
DOI:10.1016/j.envres.2016.03.006