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In this monograph the authors have attempted a study of the etiology of behavior disorders and adult criminality in twins. They collected the records of 409 pairs of twins. In this series there was some mental or behavior difficulty of one or both of the twins in each pair. The material for study was obtained from child guidance clinics, school clinics, neurologic clinics and special classes for problem children in the public schools. The cases of juvenile delinquency, i. e. delinquent boys or girls under 18 years of age, were collected from juvenile courts, especially those that were placed on probation or committed to correctional institutions. Persons 18 years of age or over who were convicted and sentenced by a criminal court to a city or county jail or to a state or federal prison or were granted probation constitute the remainder of the material.
In order that the cause
The Etiology of Child Behavior Difficulties, Juvenile Deliquency and Adult Criminality with Special Reference to Their Occurrence in Twins. JAMA. 1941;117(4):324–325. doi:10.1001/jama.1941.02820300088029