• N Erkut Kucukboyaci, Coralynn Long, Michelle Smith, Joseph F Rath, and Tamara Bushnik.
• Neuropsychology and Neuroscience and TBI Lab, Kessler Foundation, East Hanover, NJ. Electronic address: ekucukboyaci@kesslerfoundation.org.
• Arch Phys Med Rehabil. 2018 Nov 1; 99 (11): 2365-2369.

ObjectiveTo analyze the complex relation between various social indicators that contribute to socioeconomic status and health care barriers.DesignCluster analysis of historical patient data obtained from inpatient visits.SettingInpatient rehabilitation unit in a large urban university hospital.ParticipantsAdult patients (N=148) receiving acute inpatient care, predominantly for closed head injury.InterventionsNot applicable.Main Outcome MeasuresWe examined the membership of patients with traumatic brain injury in various "vulnerable group" clusters (eg, homeless, unemployed, racial/ethnic minority) and characterized the rehabilitation outcomes of patients (eg, duration of stay, changes in FIM scores between admission to inpatient stay and discharge).ResultsThe cluster analysis revealed 4 major clusters (ie, clusters A-D) separated by vulnerable group memberships, with distinct durations of stay and FIM gains during their stay. Cluster B, the largest cluster and also consisting of mostly racial/ethnic minorities, had the shortest duration of hospital stay and one of the lowest FIM improvements among the 4 clusters despite higher FIM scores at admission. In cluster C, also consisting of mostly ethnic minorities with multiple socioeconomic status vulnerabilities, patients were characterized by low cognitive FIM scores at admission and the longest duration of stay, and they showed good improvement in FIM scores.ConclusionsApplication of clustering techniques to inpatient data identified distinct clusters of patients who may experience differences in their rehabilitation outcome due to their membership in various "at-risk" groups. The results identified patients (ie, cluster B, with minority patients; and cluster D, with elderly patients) who attain below-average gains in brain injury rehabilitation. The results also suggested that systemic (eg, duration of stay) or clinical service improvements (eg, staff's language skills, ability to offer substance abuse therapy, provide appropriate referrals, liaise with intensive social work services, or plan subacute rehabilitation phase) could be beneficial for acute settings. Stronger recruitment, training, and retention initiatives for bilingual and multiethnic professionals may also be considered to optimize gains from acute inpatient rehabilitation after traumatic brain injury.Copyright © 2017 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.

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