Table 4.

Standardized Cholesky path coefficients from initial genetic (A1), shared environmental (C1) and nonshared environmental (E1) factors shared between brain area variables and cognitive measures, from four separate Cholesky decompositions

Genetic Path Coefficients
	Path	TBV	NeoC	WMat	PFC
	a11	.89 (.70, .98)*	.54(.27, .77)*	.77(.44, .87)*	.62(.19, .88)*
VIQ	a21	.23 (−.09, .48)	.45 (.01, .77)*	.27 (−.11, .66)	.41 (−.11, .82)
PIQ	a31	.57 (.32, .78)*	.67 (.27, .87)*	.47 (.19, .85)*	.59 (.12, .87)*
Reading	a41	.27 (.04, .49)*	.12 (−.30, .51)	.22 (−.10, .64)	.15 (−.43, .56)
Processing Speed	a51	.48 (.22, .70)*	.40 (.01, .72)*	.58 (.25, .83)*	.24 (−.24, .71)
Shared Environmental Path Coefficients
	Path	TBV	NeoC	WMat	PFC
	c11	.39 (0, .68)†	.75(.52, .88)*	.19(0, .64)†	.59(0, .82)†
VIQ	c21	−.16 (−.60, .55)	−.31 (−.58, .03)	.15 (−.61, .64)	−.32 (−.66, .21)
PIQ	c31	−.18 (−.55, .49)	−.02 (−.31, .29)	−.23 (−.61, .58)	−.02 (−.44, .40)
Reading	c41	−.04 (−.35, .31)	.10 (−.16, .34)	−.10 (−.45, .37)	−.01 (−.32, .31)
Processing Speed	c51	−.37 (−.80, .80)	−.13 (−.48, .21)	−.63 (−.80, .80)	.06 (−.71, .74)
Nonshared Environmental Path Coefficients
	Path	TBV	NeoC	WMat	PFC
	e11	.22 (.17, .29)*	.37(.29, .48)*	.60(.48, .75)*	.53(.41, .66)*
VIQ	e21	.05 (−.12, .21)	.05 (−.11, .22)	.01 (−.14, .17)	.02 (−.13, .19)
PIQ	e31	−.04 (−.22, .14)	.12 (−.04, .31)	−.09 (−.25, .08)	−.01 (−.18, .17)
Reading	e41	−.02 (−.22, .18)	.04 (−.17, .23)	.03 (−.13, .24)	.02 (−.15, .22)
Processing Speed	e51	−.01 (−.14, .13)	.05 (−.08, .20)	−.05 (−.16, .08)	.05 (−.09, .19)

TBV= Total Brain Volume, NeoC= Neocortex, WMat= White Matter, and PFC= Prefrontal Cortex

^*Indicates path coefficient is significant, as indicated by 95% confidence interval above zero.

^†Diagonals of the matrices were bound to above zero, so confidence intervals could not go below zero for these values, but they should be assumed to be non-significant.