Epidemiology Around 1 in 1,000 boys are born with a 47,XYY karyotype. The incidence of 47,XYY is not known to be affected by the parents' ages.
Epidemiology Around 1 in 1,00:0 boys are b:orn with a 47,XYY karyotype. The incidence of 47,XYY is not known to be affected by the parents' ages.