Table 4.

Parameter Estimates From Cholesky Models for MPQ-Estimated Psychopathic Traits (Age 17 to Age 24)

	Age 17		Age 24		Variance partition (T2)
Trait	a2	e2	a2	e2	a2 (from T1)	e2 (from T1)	a2 (unique)	e2 (unique)
Fearless Dominance
Combined	.48 (.40, .56)	.52 (.44, .60)	.42 (.33, .51)	.58 (.49, .67)	.25 (.17, .34)	.12 (.08, .18)	.17 (.10, .25)	.45 (.39, .53)
Men	.54 (.41, .64)	.46 (.36, .59)	.48 (.34, .59)	.52 (.41, .56)	.29 (.16, .42)	.10 (.04, .19)	.19 (.08, .30)	.42 (.33, .53)
Women	.46 (.35, .55)	.54 (.45, .65)	.39 (.26, .50)	.61 (.50, .74)	.23 (.13, .35)	.14 (.07, .23)	.16 (.06, .25)	.47 (.38, .58)
Impulsive Antisociality
Combined	.46 (.37, .53)	.54 (.47, .63)	.49 (.40, .57)	.51 (.43, .60)	.23 (.14, .32)	.07 (.03, .11)	.26 (.18, .34)	.44 (.38, .52)
Men	.43 (.30, .54)	.57 (.46, .70)	.49 (.35, .60)	.51 (.40, .65)	.21 (.09, .35)	.06 (.02, .13)	.28 (.14, .41)	.45 (.35, .58)
Women	.47 (.36, .56)	.53 (.44, .64)	.49 (.37, .59)	.51 (.41, .63)	.24 (.14, .36)	.08 (.03, .15)	.24 (.14, .34)	.43 (.35, .53)

Note. N = 1,252 individuals from 626 twin pairs, some with missing data. “Combined” refers to a model in which the parameter estimates were constrained across men and women. None of the parameter estimates were significantly different between men and women. a² = additive genetic variance; e² = nonshared environmental variance; Variance partition (T₂) = partitioning of the total variance at Time 2 into the genetic and environmental effects that are contributed from Time 1 (from T₁), and genetic and environmental effects that are unique to Time 2 (unique). 95% confidence intervals are listed in parentheses.