Table 4.

Multiple regressions of grey matter volume, white matter volume, total volume and cortical area in FDR correction survived regions.

Outcome variable		Predictor variable	R2	F	Sig. model	b	t	Sig. predictor	Variance predicted by AoA
Total volume	R.IFGor	AoA	0.302	4.610	0.009**			0.229
		Proficiency						0.865
		Exposure						0.059
	R.AG	AoA	0.254	3.639	0.023*	−230.971	−2.654	0.012*	16.403%
		Proficiency						0.092
		Exposure						0.970
	R.SPL	AoA	0.333	5.337	0.004**	−178.670	−3.008	0.005**	18.836%
		Proficiency						0.233
		Exposure						0.583
Grey matter volume	R.IFGor	AoA	0.299	4.545	0.009**			0.281
		Proficiency						0.958
		Exposure						0.053
	R.SPL	AoA	0.352	5.792	0.003**	−120.590	−3.097	0.004**	19.448%
		Proficiency						0.188
		Exposure						0.563
White matter volume	R.IFGor	AoA	0.236	3.292	0.033*			0.171
		Proficiency						0.873
		Exposure						0.192
	R.AG	AoA	0.315	4.900	0.006**	−93.862	−3.148	0.004**	21.252%
		Proficiency						0.122
		Exposure						0.992
Cortical area	R.IFGor	AoA	0.308	4.162	0.015*			0.338
		Proficiency						0.529
		Exposure						0.127
	R.SPL	AoA	0.270	3.453	0.030*	−45.273	−2.632	0.014*	18.063%
		Proficiency						0.661
		Exposure						0.601

Note. AoA, proficiency and exposure were added in the model as predictors. When none of the three predictors had a statistically significant contribution, we reported each predictor’s p value in the model. When any of the three predictors was a significant predictor, we reported the t, b, p values and variance explained by this predictor (p < 0.05*, p < 0.01**). R = right; IFGor = inferior frontal gyrus pars orbitalsi; AG = angular gyrus; SPL = Superior parietal lobule.