Overview
| Acronym |
CLSA |
|---|---|
| Website | |
| Contacts | |
| Start Year | 2011 |
Study Design
| Study design | Cohort |
|---|---|
| Recruitment Target |
|
| Number of participants |
50,000 |
| Number of participants with biosamples |
30,000 |
| Supplementary information about number of participants |
Biospecimens collected: blood and urine. |
Access
Access to external researchers or third parties provided or foreseen.
| Data (questionnaire-derived, measured...) |
|
|---|---|
| Biosamples |
|
| Other access |
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.
Study Timeline
Each colour in the timeline graph below represents a separate Study Population, while each segment in the graph represents a separate Data Collection Event. Clicking on a segment gives more detailed information on a Data Collection Event.
Populations
CLSA Tracking
The CLSA Tracking assessment is comprised of more than 20 000 participants who completed the telephone interview, and is a representative sample of the Canadian population.
Sources of Recruitment
| Supplementary Information | Provincial health registration databases and random digit dialing are additional sources of recruitment for the telephone interview. |
|---|
Selection Criteria
| Age | Minimum age 45, Maximum age 85 |
|---|---|
| Country | Canada |
| Other | The CLSA uses the following exclusion criteria: 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:
|
Sample Size
| Number of participants |
21,241 |
|---|
Data Collection Events
| Name | Description | Start | End |
|---|---|---|---|
| Baseline 60-minute telephone interview | The first selection of the Tracking... | 2011 (September) | 2014 (May) |
| Baseline 30-minute telephone interview (Maintaining Contact Questionnaire) | The maintaining contact interviews for the... | 2013 (September) | 2016 (January) |
| First Follow-up | The first follow-up of telephone interviews for... | 2015 (December) | 2018 (July) |
| Second Follow-up | The second follow-up of telephone interviews... | 2018 (June) | 2021 (September) |
CLSA Comprehensive
The CLSA Comprehensive assessment is comprised of more than 30 000 participants, undergoing both the face-to-face in-home interview and visit to one of the 11 Data Collection Sites (DCS) for physical assessments and biospecimen collection.
Sources of Recruitment
| General Population |
|
|---|---|
| Supplementary Information | Individuals residing within a 25-50 kilometre radius of the 11 data collection sites (Victoria, Vancouver, Surrey, Calgary, Winnipeg, Hamilton, Ottawa, Montreal, Sherbrooke, Halifax, and St. John’s) are the only areas included for Comprehensive participants. Provincial health registration databases and random digit dialing are additional sources of recruitment for in-home interviews and DCS visits. |
Selection Criteria
| Age | Minimum age 45, Maximum age 85 |
|---|---|
| Country | Canada |
| Territory |
Victoria, Vancouver, Surrey, Calgary, Winnipeg, Hamilton, Ottawa, Montréal, Sherbrooke, Halifax, and St. John’s. |
| Other | 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:
|
Sample Size
| Number of participants |
30,097 |
|---|---|
| Number of participants with biosamples |
25,504 |
Data Collection Events
| Name | Description | Start | End |
|---|---|---|---|
| Baseline in-home interview and Data Collection Site visit | The recruitment of more than 30,000... | 2012 (May) | 2015 (May) |
| Baseline 30-minute telephone interview (Maintaining Contact Questionnaire) | The maintaining contact interviews for the... | 2014 (May) | 2016 (January) |
| First Follow-up | The first follow-up of in-home, face-to-face... | 2015 (July) | 2018 (April) |
| Second Follow-up | The second follow-up of in-home, face-to-face... | 2018 (April) | 2021 (September) |
COVID
From April to December 2020, the CLSA COVID-19 Questionnaire Study collected data from 28,559 CLSA participants. The purpose of the study was to investigate the effects of the pandemic on older adults, exploring how they cope, the impacts on their physical and mental health and changes to how they access health-care services. Data was collected a weekly/biweekly and monthly basis via web-based and telephone-based interviews.
Sources of Recruitment
| Supplementary Information | Provincial health registration databases and random digit dialing are additional sources of recruitment for the telephone interview. |
|---|
Selection Criteria
| Age | Minimum age 45, Maximum age 85 |
|---|---|
| Country | Canada |
| Other | The CLSA uses the following exclusion criteria: 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:
|
Sample Size
| Number of participants |
28,559 |
|---|
Data Collection Events
| Name | Description | Start | End |
|---|---|---|---|
| COVID | 2020 (April) | 2020 (December) |