Modeling relationships between iron status, behavior, and brain electrophysiology: evidence from a randomized study involving a biofortified grain in Indian adolescents

Table 4 Results of the regression analyses examining change in the behavioral and EEG variables as a function of change in the blood iron biomarkers (analyses for plausibility). Note that if a variable does not appear in this table, no acceptable regression model was identified for that variable

		Change in Blood Variable
Task	Change variable	Predictor	Intercept	\(\hat {\beta }\)	R²
Behavioral variables
GNG	MedianRT	BdFe	64	20	0.21
ANT	RT, 2 cues	Hb	55.8	22.1	0.17
		sFt		3.9
	Alerting	sFt	81.0	4.2	0.19
	RT, spatial cues	sFt	8.7	4.0	0.18
	Orienting	sFt	-36.5	4.3	0.14
	RT, inconsistent flankers	Hb	-14.6	20.5	0.26
		sFt		4.2
	Conflict	sFt	-0.51	3.2	0.31
		sTfR		-83.1
CFE	RT	BdFe	6.86	17.12*	0.10
	Sensitivity	BdFe	0.13	0.16	0.16
	Bias	BdFe	-0.03	0.07	0.11
CRT	RT, new items	BdFe	47	-32	0.11
	RT, old items	BdFe	44	-23	0.15
	PCC	sFt	30.00	0.78	0.11
EEG variables
SRT	N1 amplitude	Hb	0.86	0.95	0.11
		BdFe		0.46
GNG	P1 amplitude	sFt	-1.4	0.08	0.13
	N! amplitude	sFt	-0.93	0.11	0.35
ANT	N1 amplitude, 2 cues	sFt	1.61	0.05	0.10
	N1 amplitude, orienting	sFt	-1.23	0.09	0.21
	P3 amplitude, orienting	sFt	-1.03	0.03	0.10
	P3 amplitude, incongruent flankers	sFt	1.78	0.06	0.25
	N1 amplitude, conflict	sFt	-0.49	0.05	0.23
	Gamma power, 2 cues	sFt	-1.02	0.05	0.15
CFE	Interaction contrast, N1 amplitude	sFt	1.01	0.05	0.15
CRT	P3 amplitude, old items 4 cues	sFt	1.24	0.03	0.10
	Gamma power, old items, 4 cues	sFt	5.49	0.11	0.10
	Gamma slope, old items 4 cues	sFt	1.55	0.07	0.12

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