How often does RTT occur?
The worldwide prevalence rate ranges from 1:10,000 to 1:23,000 live female births, making it two to three times more common in females than phenylketonuria (PKU), a congenital error of metabolism for which every newborn in the USA is tested. RTT is most often misdiagnosed as autism, cerebral palsy or non-specific developmental delay. While many health professionals may not be familiar with RTT, it is a relatively frequent cause of delayed development in girls.
