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dc.contributor.authorFulton, Lawrence V. ( Orcid Icon 0000-0001-8603-1913 )
dc.contributor.authorKruse, Clemens S. ( Orcid Icon 0000-0002-7636-1086 )
dc.date.accessioned2020-03-10T19:18:44Z
dc.date.available2020-03-10T19:18:44Z
dc.date.issued2019
dc.identifier.citationFulton, L., & Kruse, C. S. (2019). Hospital-based back surgery: Geospatial-temporal, explanatory, and predictive models. Journal of Medical Internet Research, 21(10), e14609.en_US
dc.identifier.issn1438-8871
dc.identifier.urihttps://digital.library.txstate.edu/handle/10877/9370
dc.description.abstract

Background: Hospital-based back surgery in the United States increased by 60% from January 2012 to December 2017, yet the supply of neurosurgeons remained relatively constant. During this time, adult obesity grew by 5%.

Objective: This study aimed to evaluate the demand and associated costs for hospital-based back surgery by geolocation over time to evaluate provider practice variation. The study then leveraged hierarchical time series to generate tight demand forecasts on an unobserved test set. Finally, explanatory financial, technical, workload, geographical, and temporal factors as well as state-level obesity rates were investigated as predictors for the demand for hospital-based back surgery.

Methods: Hospital data from January 2012 to December 2017 were used to generate geospatial-temporal maps and a video of the Current Procedural Terminology codes beginning with the digit 63 claims. Hierarchical time series modeling provided forecasts for each state, the census regions, and the nation for an unobserved test set and then again for the out-years of 2018 and 2019. Stepwise regression, lasso regression, ridge regression, elastic net, and gradient-boosted random forests were built on a training set and evaluated on a test set to evaluate variables important to explaining the demand for hospital-based back surgery.

Results: Widespread, unexplained practice variation over time was seen using geographical information systems (GIS) multimedia mapping. Hierarchical time series provided accurate forecasts on a blind dataset and suggested a 6.52% (from 497,325 procedures in 2017 to 529,777 in 2018) growth of hospital-based back surgery in 2018 (529,777 and up to 13.00% by 2019 [from 497,325 procedures in 2017 to 563,023 procedures in 2019]). The increase in payments by 2019 are estimated to be US $323.9 million. Extreme gradient-boosted random forests beat constrained and unconstrained regression models on a 20% unobserved test set and suggested that obesity is one of the most important factors in explaining the increase in demand for hospital-based back surgery.

Conclusions: Practice variation and obesity are factors to consider when estimating demand for hospital-based back surgery. Federal, state, and local planners should evaluate demand-side and supply-side interventions for this emerging problem.

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dc.formatText
dc.format.extent21 pages
dc.format.medium1 file (.pdf)
dc.language.isoen_USen_US
dc.publisherJMIR Publications
dc.sourceJournal of Medical Internet Research, 2019, Vol. 21, No. 10, Article e14609.
dc.subjectBack surgeryen_US
dc.subjectElastic net
dc.subjectGeospatial mapping
dc.subjectHealth economics
dc.subjectLasso
dc.subjectNeurosurgeon
dc.subjectObesity
dc.subjectPractice variation
dc.subjectRandom forest
dc.subjectRidge
dc.titleHospital-Based Back Surgery: Geospatial-Temporal, Explanatory, and Predictive Modelsen_US
txstate.documenttypeArticle
dc.identifier.doihttps://doi.org/10.2196/14609
dc.rights.license© Lawrence Fulton, Clemens Scott Kruse. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 29.10.2019. This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.
txstate.departmentHealth Administration


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