ArticleEnvironmental health : a global access science source2017
The impact of high apparent temperature on spontaneous preterm delivery: a case-crossover study.
Article in Environmental health : a global access science source, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers, 4 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
34 citing papers in PubMed, 4 syntheses or guidelines pooled it, 71 citations in OpenAlex.
- A systematic review and meta-analysis on heat thresholds for maternal health and birth outcomes.Nature communications · 2026Pooled it
- Thermal indices for assessing the impact of outdoor thermal environments on human health: a systematic review of epidemiological studies.International journal of biometeorology · 2025Pooled it
- Associations between high temperatures in pregnancy and risk of preterm birth, low birth weight, and stillbirths: systematic review and meta-analysis.BMJ (Clinical research ed.) · 2020Pooled it
- Association of Air Pollution and Heat Exposure With Preterm Birth, Low Birth Weight, and Stillbirth in the US: A Systematic Review.JAMA network open · 2020Pooled it
- Exposure to extreme temperatures may increase the risk of preterm birth: findings from a contemporary US cohort.International journal of epidemiology · 2026Article
- Tropical cyclone exposure and risk of adverse birth outcomes in urban and rural areas of Georgia.Environmental research communications · 2026Article
- Machine learning-based prediction algorithm of spontaneous preterm birth using multi-source data.BMC pregnancy and childbirth · 2025Article
- Critical windows of prenatal heat exposure and preterm birth: Metabolomic study in the Atlanta African American Maternal-Child Cohort.Science advances · 2025Article
- Prenatal exposure to ambient temperature and preterm birth: a historical cohort.International journal of epidemiology · 2025Article
- Prenatal exposure to heat and humidity and infant birth size in Ghana.Environmental research · 2025Article
- Maternal exposure to ambient temperature and risk of preterm birth in Chengdu, China, from 2017 to 2020: a cohort study.BMC public health · 2025Article
- Exposure to acute ambient temperature extremes and neonatal intensive care unit admissions: A case-crossover study.The Science of the total environment · 2024Article
- Fine Particulate Matter, Its Constituents, and Spontaneous Preterm Birth.JAMA network open · 2024Article
- A scoping review on heat indices used to measure the effects of heat on maternal and perinatal health.BMJ public health · 2024Article
- [Pregnant Women, Fetuses, and Infants Linked to Certain Health Effects after Heatwave: an Absolute and Relative Concept].Jugan geon-gang gwa jilbyeong · 2024Article
- Extreme Temperature Exposure and Risks of Preterm Birth Subtypes Based on a Nationwide Survey in China.Environmental health perspectives · 2023Article
- Adverse effects of temperature on perinatal and pregnancy outcomes: methodological challenges and knowledge gaps.Frontiers in public health · 2023Review
- Extreme Heat and Pregnancy Outcomes: A Scoping Review of the Epidemiological Evidence.International journal of environmental research and public health · 2022Article
- Acute associations between heatwaves and preterm and early-term birth in 50 US metropolitan areas: a matched case-control study.Environmental health : a global access science source · 2021Article
- Global warming, heat-related illnesses, and the dermatologist.International journal of women's dermatology · 2021Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors at 2 institutions in 1 country.
Funding
Abstract
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.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.