Table 4.

Multiple linear regression models to explore the relationship between the global executive function score and frontal Glx/Cr (Model 1) and mI/Cr ratios (Model 2).

	Outcome: Global executive function score
	Model 1: Estimated model including Glx/Cr					Model 2: Estimated model including mI/Cr
	(F(6, 89) = 18.61, p < 0.001), adjusted R2 = 0.53					(F(7, 90) = 17.16, p < 0.001), adjusted R2 = 0.54
	B	SE B	95% CI	β	p	B	SE B	95% CI	β	p
Intercept	−6.01	0.74	−7.48, −4.53		<0.001	−4.46	0.60	−5.65, −3.27		<0.001
Age at assessment	0.23	0.04	0.15, 0.31	0.46	<0.001	0.22	0.04	0.15, 0.30	0.48	<0.001
Female sex	0.12	0.09	−0.06, 0.31	0.10	0.18	0.15	0.09	−0.08, 0.29	0.12	0.11
SES	0.05	0.02	0.01, 0.10	0.18	0.03	0.05	0.02	−0.00, 0.10	0.17	0.04
Processing speed	0.02	0.00	0.01, 0.03	0.37	<0.001	0.02	0.00	0.01, 0.03	0.33	<0.001
Preterm birth	−0.06	0.11	−0.27, 0.16	−0.04	0.59	–	–	–	–	–
Glx/Cra	0.44	0.22	0.00, 0.87	0.16	0.05
mI/Cr × birth groupb						−2.84	1.21	−5.25, −0.44	−0.17	0.02

SES socioeconomic status, B unstandardized regression coefficients, SE B standard error of B, CI confidence interval, β standardized regression coefficients.

^aThe interaction effect is omitted from the model since it was nonsignificant.

^bMain effects are not presented since they cannot be interpreted in case of a significant interaction effect.