Effect of Environmental Factors on Low Weight in Non-Premature Births: A Time Series Analysis

Díaz, Julio; Arroyo, Virginia; Ortíz, Cristina; Carmona, Rocı́o; Linares, Cristina

doi:10.1371/journal.pone.0164741

Cited by 45 publications

(50 citation statements)

References 58 publications

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“…Low birth weight at the time of delivery relative to gestational age was examined by five studies [ 33 , 34 , 37 , 38 , 39 ]. Of those studies, all five addressed heat outcomes [ 33 , 34 , 37 , 38 , 39 ]; three of five found significant correlations of increased heat exposure and low birth weight [ 34 , 37 , 38 ]. Seven studies examined the general effect of decreased birthweight as a result of ambient temperature exposure [ 31 , 34 , 35 , 38 , 40 , 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

“…Inflammation may also contribute to low birth weight or preterm birth [ 58 ]. Díaz et al [ 39 ] argue that preterm birth and low birth weight outcomes must be considered separately due to the high correlation between preterm birth and low birthweight. Socioeconomic factors may further play a role, as psychological stress, social stress, and housing instability may further increase risk for preterm birth [ 58 , 59 ].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Heat Exposure and Maternal Health in the Face of Climate Change

Kuehn

McCormick

2017

IJERPH

165

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Climate change will increasingly affect the health of vulnerable populations, including maternal and fetal health. This systematic review aims to identify recent literature that investigates increasing heat and extreme temperatures on pregnancy outcomes globally. We identify common research findings in order to create a comprehensive understanding of how immediate effects will be sustained in the next generation. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guide, we systematically reviewed articles from PubMed and Cochrane Reviews. We included articles that identify climate change-related exposures and adverse health effects for pregnant women. There is evidence that temperature extremes adversely impact birth outcomes, including, but not limited to: changes in length of gestation, birth weight, stillbirth, and neonatal stress in unusually hot temperature exposures. The studies included in this review indicate that not only is there a need for further research on the ways that climate change, and heat in particular, may affect maternal health and neonatal outcomes, but that uniform standards for assessing the effects of heat on maternal fetal health also need to be established.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Heat Exposure and Maternal Health in the Face of Climate Change

Kuehn

McCormick

2017

IJERPH

165

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“…Mechanisms for maternal PM 2.5 exposure on birth weight are poorly understood at present, but several responses speculated by researchers seem to be involved: systemic oxidative stress, endothelium dysfunction, pro-inflammation and pro-thrombosis of lung or placenta after being inhaled and reaching the blood circulation of humans [58]. The development and maintenance of sufficient uteroplacental circulation in the mother is an essential circumstance for fetal growth [1,59].…”

Section: Discussionmentioning

confidence: 99%

Associations between maternal weekly air pollutant exposures and low birth weight: a distributed lag non-linear model

Jiang

Zhu

et al. 2018

Environ. Res. Lett.

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When discussing the association between birth weight and air pollution, previous studies mainly focus on the maternal trimester-specific exposures during pregnancy, whereas the possible associations between birth weight and weekly-specific exposures have been largely neglected. We conducted a nested 1:4 matched case-control study in Jinan, China to examine the weekly-specific associations during pregnancy between maternal fine particulate matter (aerodynamic diameter < 2.5 m, PM 2.5 ), nitrogen dioxide (NO 2 ), and sulfur dioxide (SO 2 ) exposure and birth weight, which is under a representative scenario of very high pollution levels. Ambient air monitoring data from thirteen monitoring stations and daily mean temperature data for Jinan during 2013-2016 were continuously collected. Birth data were obtained from the largest maternity and child care hospital of this city during 2014-2016. Individual exposures to PM 2.5 , NO 2 , and SO 2 during pregnancy were estimated using an inverse distance weighting method. Birth weight for gender-, gestational age-, and parity-specific standard score (BWGAP z-score) was calculated as the outcome of interest. Distributed lag non-linear models (DLNMs) were applied to estimate weekly-specific relationship between maternal air pollutant exposures and birth weight. For an increase of per inter-quartile range in maternal PM 2.5 exposure concentration during pregnancy, the BWGAP z-score decreased significantly during the 27th-33th gestational weeks with the strongest association in the 30th gestational weeks (standard deviation units decrease in BWGAP z-score: −0.049, 95% CI: −0.080 −0.017, in three-pollutant model). No significant association between maternal weekly NO 2 or SO 2 BWGAP z-score was observed. In conclusion, this study provides evidence that maternal PM 2.5 exposure during the 27th-33th gestational weeks may reduce the birth weight in the context of very high pollution level of PM 2.5 .

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“…The relative risk of Leqd on low birth weight was 1.09 (95 CI: 0.99–1.19) ( p < 0.1). Leqd, however, displayed an appreciably higher AR than that of PM, i.e., around 8%, though this was exclusively for the variable, low birth weight, and this increase in risk was significant at only p < 0.1 [ 23 ]. No association was reported for VLBW and ELBW.…”

Section: Road Traffic Noisementioning

confidence: 99%

WHO Environmental Noise Guidelines for the European Region: A Systematic Review on Environmental Noise and Adverse Birth Outcomes

Nieuwenhuijsen

Ристовска

Dadvand

2017

IJERPH

101

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Introduction: Three recent systematic reviews suggested a relationship between noise exposure and adverse birth outcomes. The aim of this review was to evaluate the evidence for the World Health Organization (WHO) noise guidelines and conduct an updated systematic review of environmental noise, specifically aircraft and road traffic noise and birth outcomes, such as preterm birth, low birth weight, being small for gestational age and congenital malformations. Materials and methods: We reviewed again all the papers on environmental noise and birth outcomes included in the previous three systematic reviews and conducted a systematic search on noise and birth outcomes to update previous reviews. Web of Science, PubMed and Embase electronic databases were searched for papers published between June 2014 (end date of previous systematic review) and December 2016 using a list of specific search terms. Studies were also screened in the reference list of relevant reviews/articles. Further inclusion and exclusion criteria for the studies provided by the WHO expert group were applied. Risk of bias was assessed according to criteria from the Newcastle-Ottawa quality assessment scale for case-control and cohort studies. Finally, we applied the GRADE principles to our systematic review in a reproducible and appropriate way for judgment about quality of evidence. Results: In total, 14 studies are included in this review, six studies on aircraft noise and birth outcomes, five studies (two with more or less the same population) on road traffic noise and birth outcomes and three related studies on total ambient noise that is likely to be mostly traffic noise that met the criteria. The number of studies on environmental noise and birth outcomes is small and the quality of evidence generally ranges from very low to low, particularly in case of the older studies. The quality is better for the more recent traffic noise and birth outcomes studies. As there were too few studies, we did not conduct meta-analyses. Discussion: This systematic review is supported by previous systematic reviews and meta-analyses that suggested that there may be some suggestive evidence for an association between environmental noise exposure and birth outcomes, although they pointed more generally to a stronger role of occupational noise exposure, which tends to be higher and last longer. Very strict criteria for inclusion and exclusion of studies, performance of quality assessment for risk of bias, and finally applying GRADE principles for judgment of quality of evidence are the strengths of this review. Conclusions: We found evidence of very low quality for associations between aircraft noise and preterm birth, low birth weight and congenital anomalies, and low quality evidence for an association between road traffic noise and low birth weight, preterm birth and small for gestational age. Further high quality studies are required to establish such associations. Future studies are recommended to apply robust exposure assessment methods (e.g., modeled or meas...

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Effect of Environmental Factors on Low Weight in Non-Premature Births: A Time Series Analysis

Cited by 45 publications

References 58 publications

Heat Exposure and Maternal Health in the Face of Climate Change

Heat Exposure and Maternal Health in the Face of Climate Change

Associations between maternal weekly air pollutant exposures and low birth weight: a distributed lag non-linear model

WHO Environmental Noise Guidelines for the European Region: A Systematic Review on Environmental Noise and Adverse Birth Outcomes

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