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. 2005 Apr 9;330(7495):835–838. doi: 10.1136/bmj.330.7495.835

Table 4.

Criteria for distinguishing normal variations in behaviour from more serious problems

Duration—Consider as potentially harmful any problems that last more than a few weeks; reassess mental state on several occasions
Persistence and severity of fixed symptoms—Loss of normal fluctuations in mood and behaviour
Impact of symptoms—School work, interpersonal relations, home and leisure activities