Patau Sydrome, also known as Trisomy 13 or Trisomy D is a problem with the chromosomes. People who suffer from it have an extra copy of chromosome 13. This is usually because of a problem that occurred during meiosis, but it can also be the result of Robertsonian translocation, a common rearrangement of chromosomes in humans. The risk of getting a problem during meiosis increases when women have babies later in life. The average age for this syndrome is at 31 years.
- "Prevalence and Incidence of Patau syndrome". Diseases Center-Patau Syndrome. Adviware Pty Ltd.. 2008-02-04. http://www.wrongdiagnosis.com/p/patau_syndrome/prevalence.htm. Retrieved 2008-02-17. "mean maternal age for this abnormality is about 31 years"