Individual Study / CLSA

Canadian Longitudinal Study on Aging

Canadian Longitudinal Study on Aging

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The Canadian Longitudinal Study on Aging (CLSA) is a large, national, long-term study that will follow approximately 50,000 men and women between the ages of 45 and 85 for at least 20 years. The study will collect information on the changing biological, medical, psychological, social, lifestyle and economic aspects of people’s lives. These factors will be studied in order to understand how, individually and in combination, they have an impact in both maintaining health and in the development of disease and disability as people age.

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Members

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Investigators Contacts
  • Dr. Christina Wolfson
    McGill University
  • Dr. Susan Kirkland
    Dalhousie University
  • Dr. Parminder Raina
    McMaster University
  • Dr. Ine Wauben
    McMaster University
  • Roxanne Cheeseman
    McMaster University
  • Canadian Longitudinal Study on Aging
    Statistical Analysis Centre
  • Canadian Longitudinal Study on Aging
    National Coordinating Centre

Conception

Study design
Cohort
Start Year
2002

Marker Paper

Raina PS, Wolfson C, Kirkland SA, Griffith LE, Oremus M, Patterson C, Tuokko H, Penning M, Balion CM, Hogan D, Wister A, Payette H, Shannon H, and Brazil K, The Canadian longitudinal study on aging (CLSA). Can J Aging, 2009. 28(3): p. 221-9.

PUBMED 19860977

Recruitment

Sources of Recruitment
  • Individuals

Number of participants

Number of participants
50,000
Number of participants with biosamples
30,000

Access

Availability of data and biosamples

Data
Biosamples
Other

Timeline

Populations

The CLSA Tracking is comprised of over 20 000 participants who completed the telephone interview, and is a representative sample of the Canadian population.

Selection Criteria
Minimum age
45
Maximum age
85
Newborns
Twins
Countries
  • Canada
Other criteria

Language: Individuals who are able to respond in either French or English.

Exclusion criteria: The CLSA uses the same exclusion criteria as the Statistics Canada Canadian Community Health Survey – Healthy Aging. Excluded from the study are:

  • Residents of the three territories
  • Full-time members of the Canadian Forces
  • Individuals living in long-term care institutions (i.e., those providing 24-hour nursing care) will be excluded at baseline. However, those living in households and transitional housing arrangements (e.g., seniors’ residences, in which only minimal care is provided) will be included. CLSA cohort participants who become institutionalized during the course of the study will continue to be followed either through personal or proxy interview.
  • Persons living on reserves and other Aboriginal settlements. However, individuals who are of First Nations descent who live outside reserves are included in the study.
  • Individuals with cognitive impairment at baseline

Recruitment

Sources of recruitment
  • General population
  • Participants from existing studies
General Population
  • Selected sample
  • Random digit dialing
Participants from existing studies
  • Statistics Canada Canadian Community Health Survey (CCHS) – Healthy Aging 4.2

Number of participants

Number of participants
21,242
Number of participants with biosamples
0
Data Collection Events
# Name Description Start End
0 Baseline (Tracking)

The first selection of the Tracking participants started in late 2008 in collaboration with Statistics Canada CCHS Healthy Aging module. The completion of the computer assisted telephone (CATI) ...

2011-09 2014-05
0 Maintaining contact baseline (Tracking)

The maintaining contact interviews for the Tracking participants commenced in September 2013.

2013-09 2015
0 Follow-Up One (Tracking)

The first follow-up of interviews for the Tracking participants is anticipated to begin in Spring 2015 and take two years to complete.

2015-04 2017

The CLSA Comprehensive will be comprised of approximately 30 000 participants, undergoing both the in-home interview and visit of one of the 11 data collection sites (DCS) for a complete set of clinical, biological and physical measures. It is a representative sample of the Canadian population. 

Selection Criteria
Minimum age
45
Maximum age
85
Newborns
Twins
Countries
  • Canada
Territory

Victoria, Vancouver, Surrey, Calgary, Winnipeg, Hamilton, Ottawa, Montreal, Sherbrooke, Halifax, and St. John’s.

Other criteria

The exclusion criteria are as follows:

Individuals who are unable to respond in either French or English.

Cognitively impaired individuals at the time of recruitment.

The CLSA furthermore uses the same exclusion criteria as the Statistics Canada Canadian Community Health Survey - Healthy Aging 4.2:

  • Residents of the three territories.
  • Full-time members of the Canadian Armed Forces.
  • Individuals living in long-term care institutions (i.e., those providing 24-hour nursing care) will be excluded at baseline. However, those living in households and transitional housing arrangements (e.g., seniors’ residences, in which only minimal care is provided) will be included. CLSA cohort participants who become institutionalized during the course of the study will continue to be followed either through personal or proxy interview.
  • Persons living on reserves and other Aboriginal settlements. However, individuals who are of First Nations descent who live outside reserves are included in the study.

Recruitment

Sources of recruitment
  • General population
General Population
  • Selected sample
  • Random digit dialing

Number of participants

Number of participants
30,000
Number of participants with biosamples
30,000
Supplementary Information

30,000 is the target number of Comprehensive participants with samples, to be reached in 2015.

Data Collection Events
# Name Description Start End
0 Baseline (Comprehensive)

The recruitment of over 30,000 Comprehensive participants, completing both the in-home interview and data collection site (DCS) visit, started in May 2012 and will finish in Spring 2015.

2012-05 2015-05
0 Maintaining contact baseline (Comprehensive)

The maintaining contact interviews for the Comprehensive participants started in May 2014.

2014-05 2016
0 Follow-up one (Comprehensive)

The first follow-up of interviews and DCS visits for the Comprehensive participants is anticipated to begin in Spring 2015 and take three years to complete.

2015-05 2018