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CanCHEC (Canadian Census Health and Environment Cohort)


2006 CanCHEC

The Canadian Census Health and Environment Cohorts (CanCHEC) are population-based linked datasets that follow the non-institutional (household) population at time of census for different health outcomes such as mortality and cancer as well as annual postal codes.  Briefly, data linkage for the 2006 CanCHEC was constructed using Statistics Canada’s Social Data Linkage Environment (SDLE). The SDLE helps create linked population data files for social analysis through linkage to the Derived Record Depository (DRD), a dynamic relational database containing only basic personal identifiers. Survey and administrative data are linked to the DRD using a generalized record linkage software that supports deterministic and probabilistic linkage. The 1991, 1996 and 2001 CanCHECs were constructed using the same standard generalized record linkage software by linking to tax records since the DRD had not yet been created at time of these linkages. To improve consistency across the CanCHECs, the 1991, 1996 and 2001 census-tax linkages were deterministically linked to the DRD using Social Insurance Numbers in order to update and attach different health outcomes (i.e. mortality and cancer) in an identical approach that was done for the 2006 CanCHEC. Since linkage to tax records were required for the 1991, 1996 and 2001 CanCHECs, age was restricted to the adult population (age 25+ for the 1991 CanCHEC and age 19+ for the 1996 and 2001 CanCHECs). There were no age restrictions for the 2006 CanCHEC.

Note that the mortality, cancer data and historical postal codes for the 1991, 1996 and 2001 CanCHECs will be noticeably different than the CanCHEC files that currently reside in the Research Data Centres due to differences in linkage methodology.

2001 CanCHEC

The 2001 Canadian Census Health and Environment Cohort (CanCHEC) is a large population-based dataset that allows for the examination of mortality outcomes by census characteristics (i.e. ethnocultural and socioeconomic factors). The 2001 CanCHEC was created from three different data sources:

  • 2001 Census of Population
  • T1 Universe Files (place of residence only)
  • Canadian Mortality Database

1996 CanCHEC

1991 CanCHEC

The current version of the 1991 Canadian Census Health and Environment Cohort (CanCHEC) was derived on linkage-based dataset compiling socio-economic, demographic, cancer, mortality, and place of residence data (as reported on T1 tax files) for 2.5 million Canadians over an eventual 20-year follow-up period.

The 1991 Canadian Census Health and Environment Cohort contains variables measuring population characteristics, place of residence, cancer incidence, and mortality. These variables were obtained from six different data sources:

  • 1991 Canadian Long-form Census (2B/2D), non-institutional population
  • 1984-2011 Historical Tax Summary Files (HTSF) (place of residence only)
  • 1981-1983 T1 Personal Master File (T1 PMF) (place of residence only)
  • 1969-1991 Canadian Cancer Database (CCDB),
  • 1992-2010 Canadian Cancer Registry (CCR), and
  • 1991-2011 Canadian Mortality Data Base (CMDB).

January 2018 update: Sampling weights were created for the 1991 CanCHEC to 1) make the cohort more representative of the target population (i.e. non-institutional population aged 25+) and 2) reduce bias due to missed links. Briefly, census long-form weights were adjusted by model parameters on the probability of linking to a tax record. These sampling weights were then calibrated following the raking method and incorporated trimming to prevent negative or excessively large weights.