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about chronic obstructive pulmonary disease prevalence and incidence data

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  • For each data source, information about data collection and analytical methods, limitations, the citation and additional resources can be found on the Data Sources and Methods page.

SOURCE

Original source: Institute of Clinical Evaluative Sciences (ICES)
Distributed by: Institute of Clinical Evaluative Sciences (ICES)
Cite as: Source: Chronic Obstructive Pulmonary Disease Database 1996-2013. Institute for Clinical Evaluative Sciences.

METHODS

Data Collection Methods

  • ICES uses data from the following databases to make a determination of chronic obstructive pulmonary disease prevalence and incidence:
    • Ontario Health Insurance Plan Claims Database (OHIP)
    • Discharge Abstract Database (DAD)
    • Same Data Surgery (SDS)
    • Registered Persons Database (RPDB)
  • The OHIP database contains approved physician claims data from inpatient, outpatient and long-term care settings for physicians in Ontario. Among other information, each record identifies the physician, the patient, the diagnosis responsible for the claim (which follows the ICD-9 coding scheme), the service provided and the date at which the service was provided.
  • The DAD summarizes the hospital discharge information of individuals receiving inpatient care (excluding hospitalizations in an adult mental health-designated bed. Each record contains demographic, clinical and administrative data regarding the hospitalized individual. The clinical information includes the diagnosis most responsible for the hospitalization (which follows the ICD-9 coding scheme before 2002 and the ICD-10 scheme from 2002 onwards), as well as comorbidities and procedures received.
  • The SRS summarizes same day surgery information about individuals. Each record contains the procedures undergone as well as clinical information about the individuals. The clinical information follows the ICD coding scheme (ICD-9 before the 2002 and ICD-10 from 2002 onwards).
  • The RPDB contains demographic information such as age, sex, health insurance eligibility and death information for anyone who has received Ontario health care coverage. It contains postal code information that is linkable to other geographic information such as public health unit.
  • The COPD database identifies persons aged 40 years and older in Ontario with COPD since 1991. It uses a previously-validated algorithm1 to identify persons with COPD.

Analysis Methods

  • Cases of COPD were defined as at least one record within the OHIP, the DAD or the SRS for the following codes:

    OHIP

    ICD-9 ICD Code name
    491 Chronic bronchitis
    492 Emphysema
    496 Chronic airway obstruction, not elsewhere classified

    DAD and SDS

    ICD-9 ICD Code name
    491 Chronic bronchitis
    492 Emphysema
    496 Chronic airway obstruction, not elsewhere classified

    ICD-10 ICD Code name
    J41 Simple and mucopurulent chronic bronchitis
    J42 Unspecified chronic bronchitis
    J43 Emphysema
    J44 Other chronic obstructive pulmonary disease

  • Inclusion criteria: All individuals living in the Peel public health region with chronic obstructive pulmonary disease (COPD). Individuals were identified with the disease according to COPD algorithm1 using diagnostic code information from OHIP and DAD.
  • Exclusion criteria: Individuals were excluded if they did not have an Ontario postal code or did not have contact with the Ontario health care system within the past seven years. For COPD, individuals had to be 40 years and older but less than 106 years.
  • Calculation of Prevalence: For each year, the numerator was all individuals residing in Peel region with COPD. The denominator was all individuals living in Peel according to the Ontario population estimate table. For each year (January 1 to December 31) from 1996 to 2013, the overall crude and age-sex adjusted prevalence estimates (per 1,000) were estimated. The standard population used for this calculation was the 1991 Canadian Census population.
  • Calculation of Incidence: For each year, the numerator was all individuals residing in Peel region who were newly identified in that year with COPD. The denominator was all individuals living in Peel according to the Ontario population estimate table that did not have the disease of interest (i.e. the susceptible population). For each year (January 1 to December 31) from 1996 to 2013, the overall crude and age-sex adjusted incidence estimates (per 1,000) were calculated. The standard population used for this calculation was the 1991 Canadian Census population.
  • Ontario intercensal and postcensal population estimates and projections were used to calculate prevalence and incidence rates.

LIMITATIONS

  • Currently, this data source only provides information at the Census Division (CD) or Public Health Unit (PHU) level of geography.

REFERENCES AND RESOURCES

  1. Gershon AS, Wang C, Wilton AS, Raut R, To T. Trends in chronic obstructive pulmonary disease prevalence, incidence, and mortality in Ontario, Canada, 1996 to 2007: a population-based study. Arch Intern Med 2010; 170: 5605.


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