Individual Study / OHS

Ontario Health Study
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Ontario Health Study

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Networks -
Datasets -
Variables -
Start Year
2009
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Investigators Contacts
  • OHS Research Operations & Access Officer
  • Dr. Philip Awadalla
    Ontario Institute for Cancer Research
  • Kelly McDonald
    Ontario Health Study

Design

Study design
Cohort
Follow Up
The baseline participants were recruited between 2010 and 2017. A follow-up was performed in 2016-2018 and additional follow-ups are planned in the future.
Supplementary Information

Recruitment

Recruitment Target
  • Individuals

Number of Participants

Number of Participants
225,000
Number of Participants with Biological Samples
41,000
Supplementary Information

Access

Availability of data and biosamples

Possible Access to Data
Possible Access to Biosamples
Other
Yes
No
Not applicable
Don't know

Timeline

OHS population

Selection Criteria
Minimum age
18
Newborns
Twins
Countries
  • Canada
Territory
Ethnic Origin
Health Status
Other Criteria
Supplementary Information about selection criteria
For the Pilot Phase, participants had to come from Mississauga, Owen Sound, or Sudbury.

Recruitment

Sources of recruitment
  • General population
General Population
  • Volunteer enrolment
  • Selected sample
Supplementary Information
Participants were recruited from the open community and workplaces, through commercial mailing lists and by referrals from friends and family.

Number of Participants

Number of Participants
225,000
Number of Participants with Biological Samples
41,000
Supplementary Information about selection criteria
Pilot Phase: 8,205 participants
Baseline Recruitement: 225,000 participants
Follow-Up 1: 47,773 participants
Data Collection Events
# Name Description Start End
0 OHS - Pilot phase Data on economic demographics, personal and family health histories, medications, sleep patterns, alcohol and tobacco use, physical activity and environmental exposures were collected through a ... 2009-03 2010-07
1 OHS - Baseline recruitment Data on economic demographics, personal and family health histories, medications, sleep patterns, alcohol and tobacco use, physical activity and environmental exposures were collected through a ... 2010-09 2017-03
2 OHS - Follow-up 1 Data on economic demographics, personal and family health histories, medications, sleep patterns, alcohol and tobacco use, e-cigarettes and marijuana use, physical activity, environmental ... 2016-10 2018-03
3 OHS - COVID-19 questionnaire Information on COVID-19 test results/suspected infection, symptoms experienced (if any), hospitalizations or received medical care, current health status and risk factors, potential source of ... 2020-07 2020-10

Classifications

Socio-demographic and economic characteristics
Lifestyle and behaviours
Birth, pregnancy and reproductive health history
Perception of health, quality of life, development and functional limitations
Diseases
Symptoms and signs
Medication and supplements
Non-pharmacological interventions
Health and community care services utilization
Death
Physical measures and assessments
Laboratory measures
Cognition, personality and psychological measures and assessments
Life events, life plans, beliefs and values
Preschool, school and work life
Social environment and relationships
Physical environment
Administrative information

Socio-demographic and economic characteristics

Lifestyle and behaviours

Perception of health, quality of life, development and functional limitations

Diseases

Symptoms and signs

Medication and supplements

Health and community care services utilization

Physical measures and assessments

Laboratory measures

Cognition, personality and psychological measures and assessments

Physical environment

Administrative information