Studies on hyperactivity have shown the importance of distinguishing hyperactive children according to the pervasiveness of their symptoms. To verify the meaningfulness of this distinction in Attention Deficit Disorders, an epidemiological study was undertaken. Sixteen pervasive-ADD, nine situational-ADD and 28 non-ADD children selected from a general population were compared using different measures. The results show that pervasive-ADD differ from non-ADD children on verbal IQ and reading difficulties and support the distinction of ADD according to the pervasiveness of the symptoms.

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This paper reports on continuity and change of extreme traits of temperament from age seven to 12 in subgroups selected from a large random sample and on the association of continuity with certain aspects of family functioning. Results suggest a definite degree of stability of extreme temperament over time. Implications of the findings are discussed and directions for future research suggested.