Table 3 Structural equation model results.

Outcome variable	Predictor	Estimate	Standard error	z-value	p-value
Cortical volume	BMI-PRS	−0.027	0.012	−2.242	0.025
Cortical thickness	BMI-PRS	−0.011	0.013	−0.818	0.414
Fractional anisotropy	BMI-PRS	0.003	0.011	0.229	0.819
Executive function	Cortical volume	−0.028	0.023	−1.251	0.211
	Cortical thickness	−0.027	0.019	−1.424	0.154
	Fractional anisotropy	0.100	0.020	5.041	0.000
Positive urgency	Cortical volume	−0.156	0.068	−2.282	0.022
	Cortical thickness	0.051	0.059	0.860	0.390
	Fractional anisotropy	0.030	0.060	0.503	0.615
Negative urgency	Cortical volume	−0.139	0.062	−2.249	0.025
	Cortical thickness	0.007	0.054	0.128	0.898
	Fractional anisotropy	−0.087	0.057	−1.537	0.124
BMI SDS increase	Executive function	−0.007	0.010	−0.735	0.462
	Positive urgency	0.002	0.004	0.472	0.637
	Negative urgency	0.010	0.004	2.440	0.015

BMI-PRS body mass index polygenic risk score. BMI SDS body mass index standard deviation score.

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