For Participants

The Ontario Health Study (OHS) wishes to thank the more than 225,000 Ontarians taking part in the Study, as well as the over 41,000 participants who went the extra mile to provide a blood sample. On March 31, 2018, the OHS concluded its first Follow-Up Questionnaire, which asked participants for updated information about their health, lifestyle, medical and family history, and asked new questions about e-cigarette use, marijuana use, over-the-counter medications and mental health.

Current Activities

The OHS team is making de-identified data and samples from the Study available to approved researchers in Ontario and internationally. Read how how the information you’ve provided has already been used by health scientists, and learn about ongoing studies.

OHS Dataset and Biobank

OHS Dataset OHS Dataset

*These 900+ data points are common to other population health studies in Canada and around the world, allowing researchers to accurately compare results between studies and explore more challenging research questions.

By continuing to take part in the OHS, you'll be helping to find new ways to prevent and treat major diseases like cancer, heart disease and diabetes. You'll also help to improve the health of future generations.

Follow-up Questionnaires

By remaining involved in the OHS, you will be invited to complete periodic follow-up questionnaires which will track how your health changes over time. These questionnaires will also ask about your exposures to different chronic disease risk factors.

Read more...

Stay Connected

Keep up-to date with Study announcements on our website here, or follow the OHS on Facebook and Twitter.