Risk factors and costs associated with nationwide nonelective readmission after trauma.

Background: Most prior studies of readmission after trauma have been limited to single institutions while multi-institutional studies have been limited to single states and an inability to distinguish between elective and nonelective readmissions. The purpose of this study was to identify the risk factors and costs associated with nonelective readmission after trauma across the US. Methods: The Nationwide Readmission Database was queried for all patients with nonelective admissions in 2013 and 2014 with a primary diagnosis of trauma. Univariate and multivariate logistic regression identified risk factors for 30-day nonelective same- and different-hospital readmission. The diagnosis groups on readmission were evaluated and the total cost of readmissions was calculated. Results: There were 1,180,144 patients admitted for trauma, the 30-day readmission rate was 9.4%, and 26.4% of readmissions occurred at a different hospital. The median readmission cost for patients readmitted to the same hospital was $8,298 (interquartile range $4,899-$14,911), while the median readmission cost for patients readmitted to a different hospital was $8,568 (interquartile range $4,935-$16,078, p

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