Table 4. Mediation Analysis of the association between Degree Centrality (DC), Grey Matter Volume (GMV) and Risk-taking Preference (RPI).

Mediator variable (MV)	Model 1: GMV(IV)-RPI(DV) association mediated by MV, controlled for sex and age			Model 2: GMV(IV)-RPI(DV) association mediated by MV, controlled for sex and age
	DC of left aINS			DC of right aINS
Path	Coef	SE	p	Coef	SE	p
Regress DV against MV	0.022	0.007	0.003	0.016	0.007	0.017
Regress M against IV	39.56	14.13	0.009	34.000	16.600	0.049
Regress DV against IV	1.754	0.647	0.011	1.754	0.647	0.011
Regress DV against IV and MV	(IV)1.081	0.681	0.123	(IV)1.350	0.666	0.051
	(MV)0.017	0.008	0.033	(MV)0.012	0.007	0.085
	Test statistic	p		Test statistic	p
Sobel Test	2.1	0.035		1.5	0.113

Coef: un-standardized coefficient.