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It can be inferred from the passage that the symptoms of ADHD ----.
Attention Deficit Hyperactivity Disorder (ADHD) is
diagnosed in 2 to 5 percent of children between the
ages of 6 and 16; approximately 80 percent are boys.
The typical symptoms of distractibility, hyperactivity and
agitation occur at all ages, even in adults who have the
condition, but with considerable disparity. Children often
seem forgetful or impatient, tend to disturb others and
have a hard time observing limits. Poor impulse control
manifests itself in rash decision-making, irrational
actions and rapid mood swings. The child acts before
thinking. And yet, ADHD children often behave perfectly
normally in new situations, particularly in those of short
duration that involve direct contact with individuals or
are pleasurable or exciting, like watching TV or playing
games. Precursor behaviours such as a difficult
temperament or sleep and appetite disorders have often
been found in children younger than 3 who were later
detected to have ADHD, but no definite diagnosis can
be made in those first three years. Physical restlessness
often diminishes in teenagers, but attention failure
continues and can often become associated with
aggressive or anti-social behaviour and emotional
problems, as well as a tendency towards drug abuse