Research support

• Colvert et al


  conducted a twin study from the TEDS(all twins in England and Waled between 1994-96)-culturally biased

  6423 pairs of twins,aged 8 or older,using questionnaires,checklists,observations and interviews.

  Concordance rate of ASD in MZ twins was 0.77-0.99 for DZ twins it was 0.22-0.65
• Genetic factors contribute from 56%-95%
• Genetics plays an important role