All definitional requirements for Transtorno de déficit de atenção e hiperatividade are met and inattentive symptoms are predominant in the clinical presentation. Inattention refers to significant difficulty in sustaining attention to tasks that do not provide a high level of stimulation or frequent rewards, distractibility and problems com organisation. Some hyperactive-impulsive symptoms may also be present, but these are not clinically significant in relation to the inattentive symptoms.