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. Author manuscript; available in PMC: 2019 Feb 16.
Published in final edited form as: Dev Psychopathol. 2018 Mar 22;31(1):143–156. doi: 10.1017/S0954579418000032

Table 2. Child sample characteristics.

Child variables N = 2,032
Gender
   Female 51% (1044)
   Male 49% (988)
Twin zygosity
   Identical 54% (1102)
   Fraternal 46% (930)
Harm exposure between 0-12 years 21% (422)
Internalizing symptoms at 12 years; mean (s.d.) 4.7 (3.8)
Externalizing symptoms at 12 years; mean (s.d.) 6.9 (6.9)