[Length of Y chromosome, intelligence and behaviour in a mental penal population (author's transl)].

The Y/F ratio was established in 128 mentally disordered offenders in a maximum security hospital. The 50 Y/F greater than 0.90 subjects were compared with the 78 Y/F less than 0.90 subjects as regards intelligence and behaviour. With the exception of the highest frequency of intelligence quotients lower than 70 in the criminal patients Y/F greater than or equal to 0.90, no statistical correlation exists to support the theory of a relation between a long Y chromosome and the type of psychiatric (psychopathy, psychosis) or criminality diagnosis.