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about institute for clinical evaluative sciences (ICES) chronic obstructive pulmonary disease 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.

The Institute for Clinical Evaluative Sciences (ICES) is an independent not-for-profit corporation that receives core funding from the Ontario Ministry of Health and Long-Term Care.

DATA SOURCE

Original source: Ontario Health Insurance Plan (OHIP) Claims Database, Discharge Abstract Database (DAD), Same Day Surgery (SDS) Database, Chronic Obstructive Pulmonary Disease (COPD) Database
Distributed by: Institute for Clinical Evaluative Sciences (ICES)
Cite as: Chronic Obstructive Pulmonary Disease Database, 1996-2015, Institute for Clinical Evaluative Sciences (ICES) [Data provided by special request, May, 2017].

METHODS

Data Collection Methods

ICES use data from the following databases to make a determination of chronic obstructive pulmonary disease prevalence and incidence:

  • Ontario Health Insurance Plan (OHIP) Claims Database – 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 of service.
  • Discharge Abstract Database (DAD) – The DAD summarizes the hospital discharge information of individuals receiving inpatient care in a non-mental health designated bed. Each record contains demographic, clinical and administrative data regarding the hospitalized individual, including 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.
  • Same Day Surgery (SDS) Database – The SDS summarizes same day surgery information about individuals. Each record contains the procedures undergone as well as clinical information about the individual. The clinical information follows the ICD coding scheme (ICD-9 before 2002 and ICD-10 from 2002 onwards).
  • Registered Persons Database (RPDB) – 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.
  • Chronic Obstructive Pulmonary Disease (COPD) Database – The COPD database identifies persons aged 35 years and older in Ontario with COPD since 1991. It uses a previously-validated algorithm1 to identify persons with COPD (one record within the OHIP, the DAD or the SDS).
  • Canadian Census 2011 – This database contains information from the 2011 Canadian Census including population counts.
  • Yearly Ontario intercensal and postcensal population estimates and projections – This database contains yearly estimates of the Ontario population, overall and by smaller geographical units such as public health units, as measured on July 1 of each year.

Cases of COPD were defined as at least one record within the OHIP, the DAD or the SDS 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

Data Analysis methods

  • Inclusion criteria: All individuals living in Ontario with COPD. Individuals had to be 40 years and older but less than 106 years.
  • 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.
  • Prevalence: The numerator was all individuals residing in the Region of Peel or Ontario, diagnosed with COPD since 1991. The denominator was all individuals living in the Region of Peel or Ontario (according to Ontario population estimates and projections). Total rates were age-sex-standardized and rates by sex were age-standardized to the 2011 Canadian Census population. Age-specific crude rates were also provided.
  • Incidence: For each year (January 1 to December 31) from 1996 to 2014, the numerator was all individuals residing in the Region of Peel or Ontario who were newly identified in that year with COPD. The denominator was all individuals living in the Region of Peel or Ontario (according to Ontario population estimates and projections) that did not have COPD (i.e., the susceptible population). Total rates were age-sex-standardized and rates by sex were age-standardized to the 2011 Canadian Census population. Age-specific crude rates were also provided.
  • Cells of less than or equal to 5 individuals are not reportable for privacy reasons, and appear in the tables as "NR" for "Not releasable due to small numbers".

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: 560–5.

Last updated: February 12, 2019



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