Ontario Health Study becomes largest single health study in Canadian history

March 19, 2012

More than 175,000 Ontarians have joined the Ontario Health Study (OHS), the ambitious research effort designed to help scientists understand the complex factors behind heart disease, cancer, diabetes, asthma, Alzheimer's and other common diseases. The milestone makes the OHS the largest single health study in Canadian history, and one of the most important health research efforts in the world.

"The Ontario Health Study is being watched around the globe because of the novelty of its online approach, the significance of its large scale and the diversity of participants," said Professor Lyle Palmer, Executive Scientific Director of the Ontario Health Study. "We will be following individuals over their entire lifespan, giving us the ability to look at the development and progression of common conditions in the general population."

Every Ontario adult aged 18 and over can enroll in the OHS and complete an online health questionnaire at The questionnaire, which takes 30 to 40 minutes to complete, asks participants to provide information about health-related subjects such as personal and family medical history, where they live, and their lifestyle and diet. Approximately 9.5 million Ontarians are eligible to volunteer for the Study.

"The opportunity of the Study is enormous and the larger the pool of participants, the richer our research insights and outcomes will be," said Palmer. "We have exceeded our expectations, but the goal is to recruit one million Ontarians into the Study."

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For more information :

Ontario Health Study / MaRS Centre, Heritage Building
101 College Street, Suite HL20
Toronto, Ontario
Canada, M5G 1L7

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