OSDUSOntario Student Drug Use Survey
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The OSDUS study spans two decades and is based on 14 surveys conducted every two years since 1977.
Conducted every odd year since 1977, OSDUS employs a two-stage cluster design involving a random selection of classes from within a random selection of schools (probability proportional to size) stratified by region and school type (elementary/middle or secondary).
Drug Use Among Ontario Students, 1977-2005: Detailed OSDUS Findings (CAMH Research Document Series No.