ArticleEnvironmental health : a global access science source2019
Air pollution in the week prior to delivery and preterm birth in 24 Canadian cities: a time to event analysis.
Article in Environmental health : a global access science source, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers, 1 of them a synthesis 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
16 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Climate change and waterborne diseases in temperate regions: a systematic review.Journal of water and health · 2025Pooled it
- Urban-rural heterogeneity in the association of indoor air pollution exposure with early childhood development among children aged 0-5 years in a Chinese plateau area.BMC public health · 2025Article
- Prenatal Exposure to Air Pollution and Respiratory Distress in Term Newborns: Results from the MIREC Prospective Pregnancy Cohort.Environmental health perspectives · 2024Article
- Short-term effects of air pollution exposure on the risk of preterm birth in Xi'an, China.Annals of medicine · 2023Article
- The influence of air pollution on gestational age at delivery and birthweight in patients with or without respiratory allergy: A nested case-control study.Acta obstetricia et gynecologica Scandinavica · 2023Article
- Acute air pollution and temperature exposure as independent and joint triggers of spontaneous preterm birth in New South Wales, Australia: a time-to-event analysis.Frontiers in public health · 2023Article
- : Short-term effects of exposure to particulate matter on hospital admissions for asthma and chronic obstructive pulmonary disease.Medicine · 2022Article
- Ambient air pollution and inflammatory effects in a Canadian pregnancy cohort.Environmental epidemiology (Philadelphia, Pa.) · 2021Article
- Ozone Concentration Levels in Urban Environments-Upper Silesia Region Case Study.International journal of environmental research and public health · 2021Article
- Does National Context Matter When Women Surpass Their Partner in Status?Frontiers in psychology · 2021Article
- Lagging and Flagging: Air Pollution, Shale Gas Exploration and the Interaction of Policy, Science, Ethics and Environmental Justice in England.International journal of environmental research and public health · 2020Article
- Assessment of Risk Hospitalization due to Acute Respiratory Incidents Related to Ozone Exposure in Silesian Voivodeship (Poland).International journal of environmental research and public health · 2020Article
- Acute Effects of Exposure to Ambient Air Pollutants on Preterm Birth in Xiamen City (2015-2018), China.ACS omega · 2020Article
- Time series analysis of total and direct associations between high temperatures and preterm births in Detroit, Michigan.BMJ open · 2020Article
- Risk of particulate matter on birth outcomes in relation to maternal socio-economic factors: a systematic review.Environmental research letters : ERL [Web site] · 2019Article
- Testing an infection model to explain excess risk of preterm birth with long-term iron supplementation in a malaria endemic area.Malaria journal · 2019Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors.
Funding
Abstract
backgroundNumerous studies have examined the association between air pollution and preterm birth (< 37 weeks gestation) but findings have been inconsistent. These associations may be more difficult to detect than associations with other adverse birth outcomes because of the different duration of exposure in preterm vs. term births, and the existence of seasonal cycles in incidence of preterm birth.
methodsWe analyzed data pertaining to 1,001,700 singleton births occurring between 1999 and 2008 in 24 Canadian cities where daily air pollution data were available from government monitoring sites. In the first stage, data were analyzed in each city employing Cox proportional hazards models using gestational age in days as the time scale, obtaining city-specific hazard ratios (HRs) with their 95% confidence intervals (CIs) expressed per interquartile range (IQR) of each air pollutant. Effects were examined using distributed lag functions for lags of 0-6 days prior to delivery, as well as cumulative lags from two to six days. We accounted for the potential nonlinear effect of daily mean ambient temperature using a cubic B-spline with three internal knots. In the second stage, we pooled the estimated city-specific hazard ratios using a random effects model.
resultsPooled estimates across 24 cities indicated that an IQR increase in ozone (O
conclusionsWe observed associations between daily O
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.