title: Time trend analysis of mastoidectomy procedures performed in Ontario, 1987-2007.
abstract: CONCLUSIONS
  There has been a reduction in the number of modified radical mastoidectomy and revision mastoidectomy surgeries per head of population in Ontario between 1987 and 2007, we believe that this represents a true reduction in prevalence of cholesteatoma. The increase of cases performed at the University Hospital Network, Toronto (UHN) may represent a shift to subspecialization in the treatment of chronic ear disease.
  
  
  OBJECTIVE
  To analyze the trends in mastoid operations for chronic middle ear disease in the Canadian province of Ontario between 1987 and 2007 and to determine whether an increasing proportion of these procedures are being performed in tertiary referral centres.
  
  
  METHODS
  The year on year population and number of mastoid procedures performed per year in Ontario and at the UHN between 1987 and 2007 were obtained from Statistics Canada and the Ministry of Health and Long-Term Care, Ontario, respectively. Population-adjusted rates of mastoid surgery for Ontario and the UHN. These data were collated and graphically represented for trend analysis.
  
  
  RESULTS
  The population-adjusted number of mastoid procedures for Ontario declined from 7.1 cases per 100,000 in 1986 to 4.1 cases per 100,000 in 2006. During this time the number of both modified radical mastoidectomies and revision mastoid surgeries at UHN increased.
authors: Department of Otolaryngology, Division of Otology/Neurotology, Toronto General Hospital, ON, Canada.
authors: Prodip K
authors: PK
authors: Das-Purkayastha
authors: Chris J
authors: CJ
authors: Coulson
authors: David D
authors: DD
authors: Pothier
authors: Phillip
authors: P
authors: Lai
authors: John A
authors: JA
authors: Rutka
mesh_terms: D018424:Cholesteatoma, Middle Ear / Q000453:epidemiology / Q000601:surgery*; D006801:Humans; D015994:Incidence; D008134:Long-Term Care; D008416:Mastoid / Q000601:surgery*; D009864:Ontario / Q000453:epidemiology; D013506:Otologic Surgical Procedures / Q000706:statistics & numerical data / Q000639:trends*; D015995:Prevalence; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome