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. Author manuscript; available in PMC: 2013 Jan 21.
Published in final edited form as: Twin Res Hum Genet. 2012 Jun;15(3):336–350. doi: 10.1017/thg.2012.14

TABLE 2.

Genetic and Common Environmental Contribution Estimates for Whole Brain, Left, and Right Hemisphere White Matter, Diffusion Tensor Imaging Parameters

Measure Mean rMZ rDZ a2 [95% CI] p-value c2 [95% CI] p-value
WB- FA 0.16 .86 .70 .60 [.22, .91] .0021 .25 (0, .61) .3402
WB- RD 1.21 .86 .76 .53 [.19, .91] .0021 .34 (0, .65) .1525
WB- AD 1.55 .83 .67 .57 [.19, .90] .0039 .27 (0, .62) .2805
L- FA 0.16 .84 .71 .56 [.16, .89] .0060 .28 (0, .64) .293
L- RD 1.21 .84 .73 .45 [.09, .88] .0151 .39 (0, .70) .1211

Note: a2 = genetic contribution, c2 = common environmental contribution, CI = confidenc interval, WB = whole brain, L = left, R = right, MZ = monozygotic, DZ = dizygotic