title: Estimating osteoarthritis incidence from population-based administrative health care databases.
abstract: OBJECTIVE
  The aim of the study is to develop a method to estimate osteoarthritis (OA) incidence by using administrative health care databases.
  
  
  METHODS
  Using actual counts of OA diagnoses in different periods, we generated an equation that estimated the number of new OA diagnoses based on the length of time used for excluding prevalent OA cases. Physicians billing files from 1983 to 2002 maintained at Alberta Health and Wellness were used to verify the proposed method. Age- and sex-specific and crude OA incidences in 2002 were calculated by using this method.
  
  
  RESULTS
  Women aged 50 to 59 years had the greatest incidence. For men, the greatest incidence was in the 60- to 69-year age category. Crude incidences for women and men were 1103 and 934 per 100,000 person-years, respectively. The overall crude rate was 1040 per 100,000 person-years.
  
  
  CONCLUSIONS
  Modified power function accurately summarizes the relationship between number of first OA diagnoses and length of the clearance period and thus provides an effective model to estimate OA incidence. Not restricted to OA, this model also can be implemented to estimate incidences of other chronic conditions.
authors.affiliation: Alberta Bone and Joint Health Institute, Department of Medicine, University of Calgary, Canada. jian.sun@gov.ab.ca
authors.forename: Jian
authors.initials: J
authors.lastname: Sun
authors.forename: Katherine
authors.initials: K
authors.lastname: Gooch
authors.forename: Larry W
authors.initials: LW
authors.lastname: Svenson
authors.forename: Neil R
authors.initials: NR
authors.lastname: Bell
authors.forename: Cy
authors.initials: C
authors.lastname: Frank
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D000416:Alberta / Q000453:epidemiology; D016208:Databases, Factual; D018588:Fee-for-Service Plans / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D015994:Incidence; D007345:Insurance Claim Review; D007357:Insurance, Physician Services / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D009313:National Health Programs / Q000706:statistics & numerical data*; D010003:Osteoarthritis / Q000453:epidemiology*; D011336:Probability; D012042:Registries; D018570:Risk Assessment; D017678:Sex Distribution