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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: Behav Genet. 2010 Feb 13;40(4):533–541. doi: 10.1007/s10519-010-9345-1

Table 1.

Children of twins design

Group Description Genetic risk to child Environmental risk to child
1 Affected twins High High
2 Non-affected MZ twins, with affected co-twin High Low
3 Non-affected DZ twins, with affected co-twin Moderate Low
4 Control twins Low Low