ArticleInternational journal of geographical information science : IJGIS2021
From 2SFCA to i2SFCA: integration, derivation and validation.
Article in International journal of geographical information science : IJGIS, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 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
24 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Measuring Mental Health Service Accessibility for Indigenous Populations: a Systematic Review.Journal of racial and ethnic health disparities · 2025Pooled it
- Disparities of children's obesogenic environments in Louisiana.International journal of health geographics · 2026Article
- Spatial and telehealth accessibility to eating disorder treatment in the United States: evidence from registry and LLM-augmented data.International journal of health geographics · 2026Article
- Implementing Title X: policy design, administration, and geographic access to care.Health affairs scholar · 2026Article
- Telehealth Infrastructure for Cancer Care in the United States.Scientific data · 2026Article
- Socio-spatial inequalities in accessibility of Indigenous community-controlled mental health services in South East Queensland, Australia.International journal of health geographics · 2025Article
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- Article
- Spatial analysis of prehospital emergency medical services accessibility: a comparative evaluation of the GAUSS-probability two-step floating catchment area model in Handan City.Frontiers in public health · 2025Article
- Urban and rural disparities in general hospital accessibility within a Chinese metropolis.Scientific reports · 2024Article
- Evaluating the spatial accessibility and spatial layout optimization of HIV/AIDS healthcare services in Shandong Province, China.Scientific reports · 2024Article
- Disparities in Cancer Stage Outcomes by Catchment Areas for a Comprehensive Cancer Center.JAMA network open · 2024Article
- Navigating Aged Care Services with GIS: Trends, Developments, and Future Directions.BMC geriatrics · 2024Review
- Multimodal spatial availability: A singly-constrained measure of accessibility considering multiple modes.PloS one · 2024Article
- Are There Shortages and Regional Disparities in Lecanemab Treatment Facilities? A Cross-Sectional Study.Health services insights · 2024Article
- Optimal allocation of physicians improves accessibility and workload disparities in stroke care.International journal for equity in health · 2023Article
- Refining 2SVCA Method for Measuring Telehealth Accessibility of Primary Care Physicians in Baton Rouge, Louisiana.Cities (London, England) · 2023Article
- Disparities in spatial accessibility of primary care in Louisiana: From physical to virtual accessibility.Frontiers in public health · 2023Article
- Examining the impact of COVID-19 vaccination rates on differential access to critical care.Applied geography (Sevenoaks, England) · 2022Article
- Spatial evaluation of animal health care accessibility and veterinary shortage in France.Scientific reports · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
1 author.
Funding
Abstract
Uneven distributions of population and service providers lead to geographic disparity in access for residents and varying workload for staff in facilities. The former can be captured by spatial accessibility in the traditional two-step floating catchment area (2SFCA) method; and the latter can be measured by potential crowdedness in the newly developed inverted 2SFCA (or i2SFCA) method. Residents-based accessibility and facility crowdedness are two sides of the same coin in examining the geographic variability of resource allocation. This short research note derives the formulations of both methods to solidify their theoretical foundation, and uses a case study to validate both. By doing so, the 2SFCA and i2SFCA are fully integrated into one conceptual framework, derived with extensions to the Huff model, and validated by empirical data.
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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.