Seasonal variation in emergency general surgery

Bardiya Zangbar, Peter M Rhee, Viraj Pandit, Chiu-Hsieh Hsu, Mazhar Khalil, Terence S Okeeffe, Leigh A Neumayer, Bellal A Joseph

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Objective: The aim of this study was to assess the seasonal variation in emergency general surgery (EGS) admissions. Background: Seasonal variation in medical conditions is well established; however, its impact on EGS cases remains unclear. Methods: The National Inpatient Sample (NIS) database was queried over an 8-year period (2004-2011) for all patients with diagnosis of acute appendicitis, acute cholecystitis, and diverticulitis. Elective admissions were excluded. The following data for each admission were recorded: age, sex, race, admission month, major operative procedure, hospital region, and mortality. Seasons were defined as follows: Spring (March, April, May), Summer (June, July, August), Fall (September, October, November), and Winter (December, January, February). X11 procedure and spectral analysis were performed to confirm seasonal variation. Results: A total of 63,911,033 admission records were evaluated of which 493,569 were appendicitis, 395,838 were cholecystitis, and 412,163 were diverticulitis. Seasonal variation is confirmed in EGS (F=159.12, P

Original languageEnglish (US)
Pages (from-to)76-81
Number of pages6
JournalAnnals of Surgery
Issue number1
StatePublished - 2016


  • Acute appendicitis
  • Acute cholecystitis
  • Diverticulitis
  • Emergency general surgery
  • National Inpatient Sample
  • Regression
  • Spectral analysis

ASJC Scopus subject areas

  • Surgery


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