The impact of July hospital admission on outcome after surgery for spinal metastases at academic medical centers in the United States, 2005 to 2008

Hormuzdiyar H. Dasenbrock, Michelle J. Clarke, Richard Thompson, Ziya L. Gokaslan, Ali Bydon

Research output: Contribution to journalArticle


Background: Despite widespread belief that patients admitted to teaching hospitals in July-the beginning of the academic year-have inferior outcomes, there has been little evidence to support the existence of the July phenomenon. Moreover, the impact of July admission on the outcomes after surgery for spinal metastases has not been investigated. Methods: Data from the Nationwide Inpatient Sample (2005-2008) were retrospectively extracted. Patients who underwent surgery for metastatic spinal disease and were admitted to a teaching hospital were included. Multivariate logistic regression was conducted to calculate the odds of in-hospital death, the occurrence of an intraoperative complication, and the development of a postoperative complication depending on whether admission was in July or between August and June. All analyses were adjusted for differences in patient age, sex, comorbidities, primary tumor histology, visceral metastases, myelopathy, insurance status, hospital volume, and admission type. Results: A total of 2920 admissions were evaluated. In-hospital mortality was higher in July compared with between August and June-7.5% versus 4.2%. The adjusted odds of in-hospital death were significantly higher for patients admitted in July (odds ratio [OR], 1.81; 95% confidence interval [CI], 1.13-2.91; P =.01). Patients admitted in July were significantly more likely to develop an intraoperative complication (OR, 2.11; 95% CI, 1.41-3.17; P

Original languageEnglish (US)
Pages (from-to)1429-1438
Number of pages10
Issue number5
StatePublished - Mar 1 2012



  • academic medical centers
  • quality of healthcare
  • resident education
  • seasons
  • spinal metastases
  • spinal surgery
  • surgical education
  • surgical residency

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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