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. Author manuscript; available in PMC: 2013 Jan 23.
Published in final edited form as: Behav Genet. 2012 Aug 28;43(1):1–12. doi: 10.1007/s10519-012-9559-5

Table 1.

Number of participating twin pairs by age group

Male
Female
Total
MZ DZ MZ DZ
46–50 61 62 63 58 244
51–60 153 144 147 133 577
61–70 121 106 119 100 446
71–80 152 214 213 331 910
81–90 19 19 50 61 149
>90 2 0 2 2 6
Total 508 545 594 685 2,332