If a child has the inattentive symptoms without hyperactivity, they are much less apt to be detected as having the disorder. Since a higher proportion of girls than boys have the inattentive symptoms without the hyperactivity, they are much less likely to be diagnosed. Those who have hyperactivity in childhood tend to lose some or much of the hyperactivity as they mature into adulthood. Hence, the diagnosis is more often missed in adults. However, the inattention symptoms do not tend to diminish from childhood to adulthood as hyperactivity symptoms do.