title: Role of season, temperature and humidity on the incidence of epistaxis in Alberta, Canada.
abstract: BACKGROUND
  Classical dogma holds that epistaxis is more common in winter months but there is significant variability reported in the literature. No study has yet examined the effect of season, humidity and temperature on epistaxis in a location with as severe weather extremes as seen in Alberta, Canada. The objective of the study is to evaluate for an effect of these meteorological factors on the incidence of epistaxis in Alberta.
  
  
  METHODS
  A retrospective review of consecutive adult patients presenting to the Emergency room (ER) in Edmonton and Calgary, Alberta over a three-year period was performed. Daily temperature and humidity data was recorded from the respective airports. Statistical analysis with Pearson's correlation coefficient was performed.
  
  
  RESULTS
  4315 patients presented during the study period. Mean daily temperatures ranged from a low of -40°C to a high of +23°C. A significant negative correlation was found for mean monthly temperature with epistaxis (Pearson's r = -0.835, p = 0.001). A significant correlation was also present for daily temperature and epistaxis presentation (Pearson's r = -0.55, p = 0.018, range 1.8 to 2.2 events/day). No correlation was identified with humidity and no significant seasonal variation was present.
  
  
  CONCLUSIONS
  A negative correlation was found to exist for both daily and mean monthly temperature with rates of epistaxis. A seasonal variation was seen in Edmonton but not in Calgary. No correlation was found for humidity when compared to both presentation rates and admissions.
authors.forename: Leigh J
authors.initials: LJ
authors.lastname: Sowerby
authors.forename: Joshua J
authors.initials: JJ
authors.lastname: DeSerres
authors.forename: Luke
authors.initials: L
authors.lastname: Rudmik
authors.affiliation: Division of Otolaryngology-Head & Neck Surgery, University of Alberta, Edmonton, AB, Canada. erin.wright@ualberta.ca.
authors.forename: Erin D
authors.initials: ED
authors.lastname: Wright
mesh_terms: D000328:Adult; D000368:Aged; D000416:Alberta; D003430:Cross-Sectional Studies; D004844:Epistaxis / Q000453:epidemiology*; D005260:Female; D006801:Humans; D006813:Humidity; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D012621:Seasons; D013223:Statistics as Topic; D013696:Temperature
references.citation: Ann Emerg Med. 2005 Jul;46(1):77-81
references.pmid: 15988431
references.citation: Clin Otolaryngol. 2007 Oct;32(5):361-5
references.pmid: 17883556
references.citation: Clin Otolaryngol Allied Sci. 1995 Jun;20(3):239-40
references.pmid: 7554336
references.citation: Acta Otolaryngol. 2002 Mar;122(2):183-91
references.pmid: 11936911
references.citation: J Laryngol Otol. 2005 Sep;119(9):724-6
references.pmid: 16156915
references.citation: Anesth Analg. 2008 Nov;107(5):1465-8
references.pmid: 18931200
references.citation: Ann Emerg Med. 1995 May;25(5):592-6
references.pmid: 7741333
references.citation: Chronobiol Int. 2007;24(2):357-64
references.pmid: 17453853
references.citation: Clin Otolaryngol Allied Sci. 1990 Feb;15(1):49-51
references.pmid: 2323080
references.citation: Clin Otolaryngol Allied Sci. 2002 Apr;27(2):84-8
references.pmid: 11994111
references.citation: Rhinology. 2010 Sep;48(3):348-51
references.pmid: 21038028
references.citation: Am J Med. 2000 Jun 15;108(9):759-60
references.pmid: 10946821
references.citation: Otolaryngol Head Neck Surg. 1997 Jul;117(1):49-53
references.pmid: 9230322