个人在12岁以前就出现几种不专注、过动或冲动的症状，在至少两个场合（例如学校、家庭、与朋友或亲戚在一起时、在其他活动中）中具有注意力集中困难、缺乏组织及过动/冲动的行为，且影响到其社交、人际或职业功能。 关键特征： 不专注 Inattention： 粗心大意 Often fails to give close attention to details or makes careless mistakes  难以专注 Has difficulty sustaining attention 无法遵循指示 Often does not follow through on instructions  丢三洛四 Often loses things necessary for tasks or activities  容易分心 Easily distracted by extraneous stimuli  讲话没在听 Often does not seem to listen when spoken to directly 难以组织 Has difficulty organizing tasks and activities 忘东忘西 Often forgetful in daily activities 逃避需要长时间付出心力的活动Often avoids, dislikes, or is reluctant to engage tasks that require sustained mental effort 过动/冲动Hyperactivity and impulsivity ： 常手脚不停地动或敲/踏 Often fidgets with or taps hands or feet 难以安座 Often leaves seat in situations when remaining seated is expected 难以等待 Often has difficulty waiting his or her turn 话量多 Often talks excessively 像活力马达 Is often “on the go”, acting as if “driven by a motor” 到处爬、跑（不用休息）Often runs about or climbs in situations where it is inappropriate（feeling restless）  抢着回答问题 Often blurts out an answer before a question has been completed 常打断或干扰其他人进行的活动 Often interrupts or intrudes on others 难以参与静态活动 Often unable to play or engage in leisure activities quietly