Evidence map›Paper›PMID 19014608›Full record

ArticleRespiratory research2008

Traffic-related air pollution and respiratory symptoms among asthmatic children, resident in Mexico City: the EVA cohort study.

Maria-Consuelo Escamilla-Nuñez, Albino Barraza-Villarreal, Leticia Hernandez-Cadena, Hortensia Moreno-Macias, Matiana Ramirez-Aguilar, Juan-Jose Sienra-Monge, Marlene Cortez-Lugo, Jose-Luis Texcalac, Blanca del Rio-Navarro, Isabelle Romieu

Abstract read
In one paragraph

Article in Respiratory research, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from 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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

27 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Observational
  4. Mixture analysis identifies ozone as driving factor for child asthma symptoms.The journal of allergy and clinical immunology. Global · 2025
    Article
  5. Exposure to daily mean and maximum 1-hour PMEnvironmental epidemiology (Philadelphia, Pa.) · 2025
    Article
  6. Review
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  16. Effect of exposure to ambient PMJournal of biomedical research · 2017
    Article
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  19. Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors.

Maria-Consuelo Escamilla-NuñezInstituto Nacional de Salud Pública, Mexico. mescamilla@correo.insp.mx
Albino Barraza-Villarreal
Leticia Hernandez-Cadena
Hortensia Moreno-Macias
Matiana Ramirez-Aguilar
Juan-Jose Sienra-Monge
Marlene Cortez-Lugo
Jose-Luis Texcalac
Blanca del Rio-Navarro
Isabelle Romieu

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundTaffic-related air pollution has been related to adverse respiratory outcomes; however, there is still uncertainty concerning the type of vehicle emission causing most deleterious effects.

methodsA panel study was conducted among 147 asthmatic and 50 healthy children, who were followed up for an average of 22 weeks. Incidence density of coughing, wheezing and breathing difficulty was assessed by referring to daily records of symptoms and child's medication. The association between exposure to pollutants and occurrence of symptoms was evaluated using mixed-effect models with binary response and poisson regression.

resultsWheezing was found to relate significantly to air pollutants: an increase of 17.4 microg/m3 (IQR) of PM2.5 (24-h average) was associated with an 8.8% increase (95% CI: 2.4% to 15.5%); an increase of 34 ppb (IQR) of NO2 (1-h maximum) was associated with an 9.1% increase (95% CI: 2.3% to 16.4%) and an increase of 48 ppb (IQR) in O3 levels (1 hr maximum) to an increase of 10% (95% CI: 3.2% to 17.3%). Diesel-fueled motor vehicles were significantly associated with wheezing and bronchodilator use (IRR = 1.29; 95% CI: 1.03 to 1.62, and IRR = 1.32; 95% CI: 0.99 to 1.77, respectively, for an increase of 130 vehicles hourly, above the 24-hour average).

conclusionRespiratory symptoms in asthmatic children were significantly associated with exposure to traffic exhaust, especially from natural gas and diesel-fueled vehicles.

Indexed as

Air PollutionAsthmaChildComorbidityFemaleHumansMaleMexicoPrevalenceRespiration DisordersRisk AssessmentRisk FactorsVehicle EmissionsVehicle Emissions

Identifiers

PMID19014608
PMCPMC2613139

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LicenceCC BY
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Registered trials

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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.