Prevalence of Non-Medical Tranquilizer Use Among Young People in Australia: "Around 17% of students had used tranquilisers other than for medical reasons at some point in their life. The proportions of students ever using tranquilisers increased from 13% of 12-year-olds to around 19% of 15- to 17-year-olds.
"Use in the past month was low in all ages and reached only five per cent among students aged 14 and over.
"Across all ages, around two per cent of secondary school students had used tranquilisers in the week before the survey.