Ontario Health Study

OHS IntroWith more than 225,000 participants from across the province, the Ontario Health Study (OHS) is one of Canada’s largest, long-term health studies. Through the collection of health data and information through online questionnaires, physical measures and biosamples, the OHS is a rich resource for researchers to investigate how genetics, lifestyle and environment impact health.

Participants completed a nationally harmonized baseline questionnaire collecting variables including social and economic demographics, personal and family health histories, medications, sleep patterns, alcohol and tobacco use, physical activity and environmental exposures. Regular follow-up questionnaires will be conducted to track changes in health. Almost all participants can be linked with their administrative data such as the Ontario Cancer Registry.

Non-fasting blood samples were collected from more than 41,000 participants. A subset of this group, approximately 12,600 and 13,400 participants respectively, provided urine samples and physical measures.

The OHS is one of five participating cohorts of the Canadian Partnership for Tomorrow Project (CPTP), alongside the B.C. Generations Project, the Alberta Tomorrow Project, CARTaGENE in Quebec and the Atlantic PATH. To date, the CPTP has collected data from over 300,000 Canadians. The Project’s data and biosamples are available to researchers through the CPTP Portal.

Researchers can now apply to access Ontario Health Study data and biosamples to find ways to better treat and prevent cancer and chronic disease. To find out more email access@ontariohealthstudy.ca.

Additional opportunities to collaborate

Please visit OICR’s Collaborative Research Resources directory for more opportunities to collaborate.


Find out more about what’s happening at The Ontario Health Study on OICR News.


For more information on the OHS, visit www.OntarioHealthStudy.ca.