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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Psychol Sci. 2008 Nov;19(11):1124–1130. doi: 10.1111/j.1467-9280.2008.02213.x

Table 2.

Descriptive Statistics for Transformed Cotwin Scores by Zygosity and Additive Genetic, Shared Environment, and Nonshared Environment Estimates by Parental Education.

Parent Ed. MZ Cotwins DZ Cotwins
M SD N M SD N h2g C. I. c2g C. I. e2g C. I.
All .91 .38 236 .61 .50 309 .61 (.50 − .72) .30 (.21 − .40) .09 (.04 − .13)
Low .92 .36 122 .66 .47 131 .49 (.32 − .66) .42 (.28− .55) .09 (.04 − .15)
High .91 .40 114 .55 .52 178 .71 (.55 − .88) .22 (.09 − .34) .07 (.01 − .13)

Note. Cotwin DISCR scores were transformed such that cotwin scores vary between 0 and 1 where one indicates a perfect group correlation with probands and zero indicates no group correlation with probands. C.I. = 95% confidence interval.