7.3 Mental health 232. The second Australian Child and Adolescent Survey of Mental Health and Wellbeing, commissioned by the Australian Government, was conducted in the homes of over 6,300 families with children aged 4 to 17 years in 2013– 2014.200 233. Parents and carers completed a survey and children aged 11 years and older completed their own survey. Some key findings included: • almost one in seven (13.9%) 4–17 year-olds were assessed as having mental disorders in the previous 12 months • males were more likely than females to have experienced mental disorders in the 12 months prior to the survey (16.3% compared with 11.5%) • ADHD was the most common mental disorder in children and adolescents (7.4%), followed by anxiety disorders (6.9%), major depressive disorder (2.8%) and conduct disorder (2.1%) • almost one-third (30.0% or 4.2% of all 4–17 year-olds) of children and adolescents with a disorder had two or more mental disorders at some time in the previous 12 months • about one in thirteen (7.5%) 12–17 year-olds had seriously considered attempting suicide in the previous 12 months • around one in ten 12–17 year-olds (10.9%) reported having ever selfharmed and about three quarters (73.5%) of these adolescents had harmed themselves in the previous 12 months. 201 234. The first national survey of the mental health of children and adolescents in Australia was undertaken in 1998. Between 1998 and 2013–2014, the prevalence of major depressive disorders for 6–17 year olds increased from 2.1% to 3.2%.202 235. Each year, Mission Australia conducts a national survey of youth aged 15– 19 years, asking them about the issues that concern them. In 2017, there were more than 24,000 responses. Mental health was identified as their main concern.203 236. In 2017, Mission Australia with Black Dog Institute released a joint FiveYear Youth Mental Health Report about the mental health of Australia’s 40