Skip to main content
. Author manuscript; available in PMC: 2021 Jul 1.
Published in final edited form as: J Child Psychol Psychiatry. 2020 Jan 16;61(7):807–817. doi: 10.1111/jcpp.13188

Table 2.

Mean aggression scores from the saturated twin model

MZM DZM MZF DZF OSDZ
Agg1 Agg2 Agg1 Agg2 Agg1 Agg2 Agg1 Agg2 Agg1 Agg2
Mean 0.305 0.277 0.293 0.270 0.108 0.083 0.127 0.100 0.243 0.068
SD 0.008 0.008 0.008 0.007 0.007 0.006 0.007 0.007 0.005 0.004

Agg1 is the score for twin 1, and Agg2 is the score for twin 2. For OSDZ twins, the male twin is always twin 1 and the female twin is always twin 2. For the current analysis, twin 1 and twin 2 codes were arbitrarily assigned for same-sex pairs.