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Geographical distribution of participants by Ontario public health unit, based on self-reported postal code at enrolment. The Ontario Health Study (OHS) has representation across each of Ontario’s public health units, with enrolment greatest in catchment areas for the City of Toronto Health Unit (n = 45 367), followed by the City of Ottawa Health Unit (n = 24 194) and Peel Regional Health (n = 17 114). Enrolment is roughly proportional to the size of the populations served
