ArticleHeadache2023
Wildfire smoke exposure and emergency department visits for headache: A case-crossover analysis in California, 2006-2020.
Article in Headache, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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
10 citing papers in PubMed, 20 citations in OpenAlex.
- Québec Wildfires and Respiratory Emergency Department Visits in Charlottesville, Virginia.EcoHealth · 2026Article
- Wildfire-Sourced PM2.5 and Emergency Department Visits for Migraine and Other Primary Headache.JAMA network open · 2026Article
- Association between wildfire smoke exposure and pediatric emergency department visits for headache.Headache · 2026Article
- Pitfalls of Using Negative Control Outcomes in Environmental Epidemiology.Current environmental health reports · 2025Article
- Analysis of brain scan findings requested from individuals visiting the emergency department outpatient clinic with headache.Northern clinics of Istanbul · 2025Article
- Article
- Neuroinflammation is dependent on sex and ovarian hormone presence following acute woodsmoke exposure.Scientific reports · 2024Article
- Wildfire Smoke and Its Neurological Impact.JAMA neurology · 2024Article
- The Environment and Headache: a Narrative Review.Current environmental health reports · 2024Review
- Wildfires are associated with increased emergency department visits for anxiety disorders in the western United States.Nature. Mental health · 2024Article
Corrections and comments
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Authors and funding
9 authors at 5 institutions in 1 country.
Funding
Abstract
objectiveTo evaluate the association of short-term exposure to overall fine particulate matter of <2.5 μm (PM
backgroundStudies have reported associations between PM
methodsOur study included adult Californian members (aged ≥18 years) of a large de-identified commercial and Medicare Advantage claims database from 2006 to 2020. We identified ED visits for primary headache disorders (subtypes: tension-type headache, migraine headache, cluster headache, and "other" primary headache). Claims included member age, sex, and residential zip code. We linked daily overall and wildfire-specific PM
resultsAmong 9898 unique individuals we identified 13,623 ED encounters for primary headache disorders. Migraine was the most frequently diagnosed headache (N = 5534/13,623 [47.6%]) followed by "other" primary headache (N = 6489/13,623 [40.6%]). For all primary headache ED diagnoses, we observed an association of 7-day average wildfire PM
conclusionsAlthough imprecise, these results suggest short-term wildfire PM
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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.