Attention deficit hyperactivity disorder (ADHD) is a
behavioural disorder characterised by symptoms of inattention,
impulsivity and hyperactivity.
The prevalence of ADHD among children worldwide is estimated at
5%* and at present it is estimated to affect 2% of the total
world's population**. As the illness can often result in
disruptive behaviour in the classroom, it is often first
identified at school.
Although ADHD is generally considered a childhood disorder, it
is now known that approximately two thirds of children affected
with ADHD symptoms can carry the condition into adolescence and
*Polanczyk, G et al (2007), The Worldwide Prevalence of ADHD: A
systematic Review and Metaregression Analysis, AM J Psychiatry
2007; 164:942-948 **Using DSM-IV criteria