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ability to recall the onset of their child’s symp-toms.3 initiall to mee recogn 7 year age-of-increas affectin receive asked ago, frequently with no corroborating informants available. This situation creates obvious diffi-culties in establishing the diagnosis.5 Subsequent evidence has suggested that ADHD without evi-dence of onset before 7 years of age is a valid for ADHD using information from mothers and teachers. Only 2 children who fulfilled the diag-onset ng to onset ase of e pre-ferent linical This ildren s old whose mothers or teachers had not reported symptoms at or before 7 years of age, supporting the nature of ADHD as a disorder that begins early in life. What our study did not address is the modification of prevalence rate when s’diagnosis.5,6 onset of symptoms is assessed through parentJOURNAL VOLUMOne study reported that 46 % of children y diagnosed with ADHD who continued t criteria at 5-year follow-up were no longer ized as having presented symptoms before s of age.4 Even more concerns about the onset criterion were raised as ADHD ingly became viewed as a chronic disorder g adults. Most adults with ADHD never d a childhood diagnosis. These adults are to recall symptoms that occurred decades nostic criteria for ADHD presented new-symptoms after 7 years of age accordi mothers and teachers. Thus, extending the age to 12 years resulted in an absolute incre 0.1%, or a relative increase of only 3 % in th valence rate. In addition, children with dif ages of onset showed similar patterns of c and cognitive features and risk factors.8 study showed that there are virtually no ch with a full ADHD diagnosis at 12 yearsymptoms producing impairment. ” In addition to the question of criterion validity, questions about reliability arose. Studies after the introduction of the DSM-IV showed that parents have poorHow Evidence on th