Evidence map›Paper›PMID 25889646›Full record

Observational studyInternational journal for equity in health2015

Travel distance and sociodemographic correlates of potentially avoidable emergency department visits in California, 2006-2010: an observational study.

Brian K Chen, James Hibbert, Xi Cheng, Kevin Bennett

Abstract readObservational Study
In one paragraph

Observational study in International journal for equity in health, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed, 1 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

20 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Determinants of long-term quality of life in nasopharyngeal carcinoma survivors: the roles of household income and performance status.Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer · 2026
    Article
  3. Article
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  6. Decreasing Racial Disparities in Preventable Emergency Department Visits Through Hospital Health Information Technology Patient Engagement Functionalities.Telemedicine journal and e-health : the official journal of the American Telemedicine Association · 2023
    Observational
  7. Article
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  14. Geographic Expansion of Federally Qualified Health Centers 2007-2014.The Journal of rural health : official journal of the American Rural Health Association and the National Rural Health Care Association · 2019
    Article
  15. Article
  16. Patients' and Clinicians' Perceptions of Antibiotic Prescribing for Upper Respiratory Infections in the Acute Care Setting.Medical decision making : an international journal of the Society for Medical Decision Making · 2018
    Article
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  18. Observational
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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

4 authors.

Brian K ChenDepartment of Health Services Policy and Management, Arnold School of Public Health, University of South Carolina, 915 Greene Street Suite 354, Columbia, SC, 29208, USA. bchen@mailbox.sc.edu.
James HibbertCenter for Research in Nutrition and Health Disparities, University of South Carolina, 921 Assembly Street #230, Columbia, SC, 29208, USA. hibbert@sc.edu.
Xi ChengArnold School of Public Health, University of South Carolina, 915 Greene Street, Columbia, SC, 29208, USA. chengximph@gmail.com.
Kevin BennettFamily and Preventive Medicine, University of South Carolina School of Medicine, 3209 Colonial Dr., Columbia, SC, 29203, USA. kevin.bennett@usmed.sc.edu.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionUse of the hospital emergency department (ED) for medical conditions not likely to require immediate treatment is a controversial topic. It has been faulted for ED overcrowding, increased expenditures, and decreased quality of care. On the other hand, such avoidable ED utilization may be a manifestation of barriers to primary care access.

methodsA random 10% subsample of all ED visits with unmasked variables, or approximately 7.2% of all ED visits in California between 2006 and 2010 are used in the analysis. Using panel data methods, we employ linear probability and fractional probit models with hospital fixed effects to analyze the associations between avoidable ED utilization in California and observable patient characteristics. We also test whether shorter estimated road distances to the hospital ED are correlated with non-urgent ED utilization, as defined by the New York University ED Algorithm. We then investigate whether proximity of a Federally Qualified Health Center (FQHC) is correlated with reductions in non-urgent ED utilization among Medicaid patients.

resultsWe find that relative to the reference group of adults aged 35-64, younger patients generally have higher scores for non-urgent conditions and lower scores for urgent conditions. However, elderly patients (≥65) use the ED for conditions more likely to be urgent. Relative to male and white patients, respectively, female patients and all identified racial and ethnic minorities use the ED for conditions more likely to be non-urgent. Patients with non-commercial insurance coverage also use the ED for conditions more likely to be non-urgent. Medicare and Medicaid patients who live closer to the hospital ED have higher probability scores for non-emergent visits. However, among Medicaid enrollees, those who live in zip codes with an FQHC within 0.5 mile of the zip code population centroid visit the ED for medical conditions less likely to be non-emergent.

conclusionsThese patterns of ED utilization point to potential barriers to care among historically vulnerable groups, observable even when using rough estimates of travel distances and avoidable ED utilization.

Indexed as

Insurance CoverageInsurance, HealthSocial ClassTravelAdultCaliforniaDatabases, FactualEmergency Service, HospitalFemaleHumansMaleMiddle Aged

Identifiers

PMID25889646
PMCPMC4391132

What OpenQuestion holds

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Registered trials

None linked

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.