Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Interhospital Transfer Network for Very Low Birth Weight Infants in
  the United States   Very low birth weight (VLBW) infants require specialized care in neonatal
intensive care units. In the United States (U.S.), such infants frequently are
transferred between hospitals. Although these neonatal transfer networks are
important, both economically and for infant morbidity and mortality, the
national-level pattern of neonatal transfers is largely unknown. Using data
from Vermont Oxford Network on 44,753 births, 2,122 hospitals, and 9,722
inter-hospital infant transfers from 2015, we performed the largest analysis to
date on the inter-hospital transfer network for VLBW infants in the U.S. We
find that transfers are organized around regional communities, but that despite
being largely within state boundaries, most communities often contain at least
two hospitals in different states. To classify the structural variation in
transfer pattern amongst these communities, we applied a spectral measure for
regionalization and found an association between a community's degree of
regionalization and their infant transfer rate, which was not utilized in
detecting communities. We also demonstrate that the established measures of
network centrality and hierarchy, e.g., the community-wide entropy in PageRank
or betweenness centrality and number of distinct `layers' within a community,
correlate weakly with our regionalization index and were not significantly
associated with metrics on infant transfer rate. Our results suggest that the
regionalization index captures novel information about the structural
properties of VLBW infant transfer networks, have the practical implication of
characterizing neonatal care in the U.S., and may apply more broadly to the
role of centralizing forces in organizing complex adaptive systems.

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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: eess