Skip to main content
. Author manuscript; available in PMC: 2014 May 9.
Published in final edited form as: Behav Genet. 2013 Feb 10;43(3):208–219. doi: 10.1007/s10519-012-9581-7

Table 1.

Number of MZ and DZ twin pairs (NMZ; NDZ) within the age categories as used by Haworth et al. and as used in the present study.

Haworth et al. Present
Group no Age NMZ NDZ Age NMZ NDZ
1 4–10 1140 1613 4–10 1140 1613
2 11–13 2195 2722 11–13 2195 2722
3 14–34 1507 1582 14–16 807 966
4 - - - 17–34 700 616
total N - 4842 5917 - 4842 5917