Exposure to low outdoor temperature in the midtrimester is associated with low birth weight

Elter, Koray; Ay, Emine; Uyar, Esra; Kavak, Zehra Neşe

doi:10.1111/j.1479-828x.2004.00314.x

Cited by 49 publications

(52 citation statements)

References 24 publications

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“…In a previous study to evaluate residential mobility during pregnancy and the potential for ambient air pollution exposure misclassification in upstate New York, 16.5% of mothers moved during pregnancy and most moved a short distance within the same exposure region (Chen et al, 2010). Confounding may be present due to unmeasured nutritional factors, infection, indoor air pollution, and other factors which vary by season (Chodick et al, 2009;Elter et al, 2004;Murray et al, 2000;Strand et al, 2011). Bias due to these unmeasured factors is likely nondifferential by case-control status.…”

Section: Study Limitationsmentioning

confidence: 84%

“…Hypertensive disorders of pregnancy were associated with winter delivery in a systematic review of the literature (TePoel et al, 2011). Low birth weight has been associated with low temperatures in the first (Chodick et al, 2007), second (Elter et al, 2004;Murray et al, 2000), and third trimesters (Chodick et al, 2007;Lawlor et al, 2005). Exposure to "too cold" environmental conditions at work was associated with spontaneous abortion in one study (McDonald et al, 1988).…”

Section: Introductionmentioning

confidence: 93%

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Extreme winter temperature and birth defects: A population-based case-control study

Zutphen

Hsu

Lin

2014

Environmental Research

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Section: Study Limitationsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 93%

Extreme winter temperature and birth defects: A population-based case-control study

Zutphen

Hsu

Lin

2014

Environmental Research

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“…In addition, studies in Marmara University Hospital, Turkey (Elter et al, 2004) and Northern Ireland (Murray et al, 2000) found associations between exposures to colder temperatures during the mid-trimester and lower birth weight, while studies in two German states (Wolf and Armstrong, 2012) and Uppsala, Sweden (Bruckner et al, 2014) did not find clear associations for any pregnancy windows. The discrepancy in findings with respect to cold temperature can partially be explained by differences in study design, study location, and geographical difference in temperature distributions.…”

Section: Discussionmentioning

confidence: 99%

Ambient temperature and air quality in relation to small for gestational age and term low birthweight

Zhu

Liu

et al. 2017

Environmental Research

104

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Background Exposures to extreme ambient temperature and air pollution are linked to adverse birth outcomes, but the associations with small for gestational age (SGA) and term low birthweight (tLBW) are unclear. We aimed to investigate exposures to site-specific temperature extremes and selected criteria air pollutants in relation to SGA and tLBW. Methods We linked medical records of 220,572 singleton births (2002–2008) from 12 US sites to local temperature estimated by the Weather Research and Forecasting model, and air pollution estimated by modified Community Multiscale Air Quality models. Exposures to hot (>95th percentile) and cold (<5th percentile) were defined using site-specific distributions of daily temperature over three-month preconception, each trimester, and whole-pregnancy. Average concentrations of five criteria air pollutants and six fine particulate matter constituents were also calculated for these pregnancy windows. Poisson regression with generalized estimating equations calculated the relative risks (RR) and 95% confidence intervals for SGA (weight <10th percentile conditional on gestational age and sex) and tLBW (≥37 weeks and <2,500 grams) associated with an interquartile range increment of air pollutants, and cold or hot compared to mild (5–95th percentile) temperature. Models were adjusted for maternal demographics, lifestyle, and clinical factors, season, and site. Results Compared to mild temperature, cold exposure during trimester 2 [RR: 1.21 (1.05–1.38)], trimester 3 [RR: 1.18 (1.03–1.36)], and whole-pregnancy [RR: 2.57 (2.27–2.91)]; and hot exposure during trimester 3 [RR: 1.31 (1.15–1.50)] and whole-pregnancy [RR: 2.49 (2.20–2.83)] increased tLBW risk. No consistent association was observed between temperature and SGA. Air pollutant analyses were generally null but preconception elemental carbon was associated with a 4% increase in SGA while dust particles increased tLBW by 10%. Particulate matter ≤10 microns in the second trimester and whole pregnancy also appeared related to tLBW. Conclusions: Our findings suggest prenatal exposures to extreme ambient temperature relative to usual environment may increase tLBW risk. Given concerns related to climate change, these findings merit further investigation.

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“…However the power of this study was low as only 126 men (10.8%) and 118 women (20.2%) were classified obese. Birth weight has been noted to correlate with overweight in late adolescence ("strongly" Seidman et al 1991) and with obesity in later life ("weakly" Toft Sorensen et al 1997) and low outdoor temperature during pregnancy (second trimester) is associated with lower birth weight (Elter et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Is Air Temperature at Birth Associated with Body Mass Index in 9–10 Year-Old Children?

Hackett¹,

Stott²,

Boddy³

et al. 2009

Ecology of Food and Nutrition

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Several studies suggest that temperature (season) at birth affects body weight and obesity years later. This study related air temperature at birth to body mass index in Liverpool primary school children (n = 11,084). No association was found between body mass index categories and month or season of birth and only weak correlations with month of birth and air temperature at birth. These correlations disappeared when controlled for precise age and an index of deprivation but girls in the third quintile for deprivation had a higher body mass index if born in colder weather.

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Exposure to low outdoor temperature in the midtrimester is associated with low birth weight

Abstract: Exposure to low outdoor ambient temperature in the midtrimester can be associated with low birth weight.

Cited by 49 publications

References 24 publications

Extreme winter temperature and birth defects: A population-based case-control study

Extreme winter temperature and birth defects: A population-based case-control study

Ambient temperature and air quality in relation to small for gestational age and term low birthweight

Is Air Temperature at Birth Associated with Body Mass Index in 9–10 Year-Old Children?

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