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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 2.

Twin correlations in the overall sample

Male
Female
Total
MZ DZ MZ DZ MZ DZ
Depression symptoms .29 (N = 502) .14 (N = 537) .32 (N = 590) .11 (N = 678) .31 (N = 1,092) .12 (N = 1,215)
Cognitive composite .52 (N = 486) .29 (N = 522) .47 (N = 575) .29 (N = 645) .50 (N = 1,061) .29 (N = 1,167)
Grip strength .54 (N = 452) .30 (N = 454) .55 (N = 484) .29 (N = 465) .55 (N = 936) .30 (N = 919)

All twin correlations have been adjusted for the main effects of age, squared age and sex