What are the manifestations of childhood ADHD?

Patient's question:

Unable to concentrate in class, staring blankly
Onset time: 2005
Laboratory test results: Abnormal EEG

Doctor's answer:

First, in situations where activity is allowed, such as during class breaks or after school, no matter how intense a child's activity is, it does not have diagnostic significance. Only when a child remains restless and uncontrollable in situations where activity is not appropriate, such as during class or while doing homework, does it have diagnostic significance.
Second, if there is only excessive activity without attention deficits, it cannot be diagnosed as ADHD. Conversely, if there are significant attention deficits without excessive activity, it should be considered as a possible case of ADHD, because some children are classified as "ADHD without hyperactivity." In the United States, since 1979, based on the most common and prominent symptom of ADHD being difficulty concentrating, the term "ADHD" has been changed to "Attention Deficit Disorder" and divided into two types: "Attention Deficit Hyperactivity Disorder" (ADHD with hyperactivity) and "Attention Deficit Disorder without Hyperactivity" (ADHD without hyperactivity), which is essentially the same as "ADHD without hyperactivity."