The OSDUS from the Centre for Addiction and Mental Health (CAMH), Toronto, is the longest ongoing school survey of adolescents in Canada, conducted every 2 years since 1977.
The OSDUS applied a 2-stage (school and class) cluster sampling design, stratified by school board (a regional office that oversees a group of publicly funded schools) (22) and school type (grade level).
The 2003 OSDUS shows that approximately 44% of Ontario students were involved in bullying: 14.
3) By including a broad range of ages, the 2003 OSDUS allowed for greater detail on the relationships among age, bullying, and smoking, particularly from a developmental perspective.
The Mental Health and Well-Being of Ontario Students 1991-2001: Findings from the OSDUS.