It is difficult to say exactly how many children or adults worldwide have ADHD because different countries have used different ways of diagnosing it, while some do not diagnose it at all. In the UK, diagnosis is based on quite a narrow set of symptoms, and about 0.5–1% of children are thought to have<unk>  or<unk>  problems. In comparison, professionals in the U.S. used a much broader<unk> ion of the term ADHD until recently. This meant up to 10% of children in the U.S. were described as having ADHD. Current estimates suggest that ADHD is present internationally in about 7.2% of children. About five times more boys than girls are diagnosed with ADHD. Boys are seen as the prototypical ADHD child, therefore they are more often diagnosed with ADHD than girls. This may be partly because of the particular ways they express their difficulties. Boys and girls both have<unk>  problems, but due to differences in gender and symptoms, boys may come off as more active in their symptoms and therefore may seem harder to manage. Children from all cultures and social groups are diagnosed with ADHD. However, children from certain backgrounds may be particularly likely to be diagnosed with ADHD, because of different expectations about how they should behave. It is, therefore, important to ensure that a child's cultural background is understood and taken into account as part of the assessment.
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