Ambient temperature as a trigger of preterm delivery in a temperate climate

Cox, Bianca; Vicedo‐Cabrera, Ana M.; Gasparrini, Antonio; Roels, Harry; Martens, Evelyne; Vangronsveld, Jaco; Forsberg, Bertil; Nawrot, Tim S.

doi:10.1136/jech-2015-206384

Cited by 57 publications

(47 citation statements)

References 50 publications

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“…Finally, similar to several other studies [ 23 , 26 , 28 , 47 ] we found an association between apparent air temperature and PTD independent of air pollutants.…”

Section: Discussionsupporting

confidence: 92%

“…The differences highlighted between seasons in our study may help explain the ambiguity of the relationship between increases in apparent temperature and PTD that has emerged in the literature. With one exception [ 47 ], studies conducted in more temperate climates such as Montreal, London and Germany [ 25 , 29 , 48 ] failed to find a heat-related effect on preterm deliveries. Yet, a majority of the research conducted in warmer climate regions has noted an increase in preterm labor and/or deliveries associated with increases in apparent temperature [ 23 , 26 – 28 , 30 , 31 ].…”

Section: Discussionmentioning

confidence: 99%

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The impact of high apparent temperature on spontaneous preterm delivery: a case-crossover study

Avalos

Chen

et al. 2017

Environ Health

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BackgroundDespite the prediction that temperatures are expected to increase in the future, little is known about the health effects of increasing temperatures on pregnant women. The objective of this study was to investigate the impact of apparent temperature on spontaneous preterm delivery (PTD).MethodsA case-crossover study of 14,466 singleton spontaneous preterm deliveries occurring between January 1, 1995 and December 31, 2009 among Kaiser Permanente Northern California (KPNC) members was conducted. Preterm deliveries were identified through KPNC's Electronic Health Records (EHR) data. Data on gestational age at delivery, infant sex, and maternal address were also extracted from KPNC's EHR and linked to meteorologic and air pollution monitoring data based on residential zip code.ResultsAn 11.6% (95% CI: 4.1, 19.7) increase in spontaneous PTD was associated with a 10 °F (5.6 °C) increase in weekly average (lag06) apparent temperature, during the warm season. During the cold season, increases in apparent temperature did not significantly impact the overall effect of spontaneous PTD (6.2%, (95% CI: -3.0, 16.2) per 10 °F (5.6 °C) increase in weekly average (lag06) apparent temperature). Significant differences in the relationship between apparent temperature and spontaneous PTD emerged for region, gestational age and infant sex, during the cold season. No significant differences emerged for air pollutants.ConclusionsOur findings provide evidence for an increase in the odds of spontaneous PTD associated with increases in apparent temperature, especially during the warm season.Electronic supplementary materialThe online version of this article (doi:10.1186/s12940-017-0209-5) contains supplementary material, which is available to authorized users.

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“…Finally, similar to several other studies [ 23 , 26 , 28 , 47 ] we found an association between apparent air temperature and PTD independent of air pollutants.…”

Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

The impact of high apparent temperature on spontaneous preterm delivery: a case-crossover study

Avalos

Chen

et al. 2017

Environ Health

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“…In comparison, Cox et al . 22 reports RR values increase from 1.02 to 1.15 when the daily minimum temperature increases from 8.3 to 16.3 °C and of 1.05 to 1.28 when the daily maximum temperature increases from 14.7 to 26.5 °C on a 1-day lag basis for a temperate climate environment in Belgium, Europe. In the same literature, Cox et al .…”

Section: Discussionmentioning

confidence: 92%

“…In the same literature, Cox et al . 22 summarizes studies of temperature-related increase in PTB rates for both temperate and warmer climates and find inconclusive results. Zhang et al .…”

Section: Discussionmentioning

confidence: 99%

Potential influence of temperature and precipitation on preterm birth rate in Puerto Rico

Xue

Feric

Cordero

et al. 2018

Sci Rep

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The preterm birth (PTB) rate for singletons born in the tropical Caribbean island Puerto Rico increased from 11.3% in 1994, which was comparable to rates in the U.S., to as high as 18.3% in 2006 before decreasing to 15.5% in 2012. A few studies have reported that weather extremes are associated with higher risk of preterm birth, however, the effects of ambient temperature and precipitation has not been well examined in Puerto Rico. We compiled child birth data from the National Center for Health Statistics and weather data from the National Oceanic and Atmospheric Administration from 1994 to 2012. We explored the association between the weather factors and PTB rates with a distributed lag non-linear model (DLNM). We did not find direct association of lagged effect of temperature on birth outcome over monthly timescales. Both high intensity and frequency of precipitation and high frequency of storm and flood events are associated with increased risk of PTB rates. While the weather factors do not explain the marked increase and decrease in PTB rate, we emphasize the negative effects on PTB from weather extremes particularly precipitation in Puerto Rico.

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“…In a simulation study, DLMs provided unbiased estimates and correctly identified susceptible periods while models using pre-specified, period-averaged exposure (with or without simultaneous adjustment) resulted in biased estimates (17). Susceptible periods for perinatal and pediatric health outcomes have been investigated using DLMs in studies of air pollutants (34)(35)(36)(37), temperature (38)(39)(40)(41), and tooth manganese levels (42). For example, Chiu et al estimated associations of PM 2.5 with child neurodevelopment using 1) prespecified trimester-or pregnancy-averaged PM 2.5 exposure modeled using multivariable linear regression models, and 2) weekly-averaged PM 2.5 exposure modeled with DLMs (34).…”

Section: Distributed Lag Modelsmentioning

confidence: 99%

Statistical Approaches for Investigating Periods of Susceptibility in Children’s Environmental Health Research

Buckley

Braun

2019

Curr Envir Health Rpt

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Purpose of Review: Children's environmental health researchers are increasingly interested in identifying time intervals during which individuals are most susceptible to adverse impacts of environmental exposures. We review recent advances in methods for assessing susceptible periods. Recent Findings: We identified three general classes of modeling approaches aimed at identifying susceptible periods in children's environmental health research: multiple informant models, distributed lag models, and Bayesian approaches. Benefits over traditional regression modeling include the ability to formally test period effect differences, to incorporate highly timeresolved exposure data, or to address correlation among exposure periods or exposure mixtures. Summary: Several statistical approaches exist for investigating periods of susceptibility. Assessment of susceptible periods would be advanced by additional basic biological research, further development of statistical methods to assess susceptibility to complex exposure mixtures, validation studies evaluating model assumptions, replication studies in different populations, and consideration of susceptible periods from before conception to disease onset.

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Ambient temperature as a trigger of preterm delivery in a temperate climate

Cited by 57 publications

References 50 publications

The impact of high apparent temperature on spontaneous preterm delivery: a case-crossover study

The impact of high apparent temperature on spontaneous preterm delivery: a case-crossover study

Potential influence of temperature and precipitation on preterm birth rate in Puerto Rico

Statistical Approaches for Investigating Periods of Susceptibility in Children’s Environmental Health Research

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