Table 5.

Regression analyses for the relations between contaminants and ERP parameters

	Cord Hg			Cord PCB 153		11-year Hg		11-year PCB 153
	N	r	Std β	r	Std β	R	Std β	r	Std β
Standard condition
N1 latency	113	0.06	0.04 d,o,e,f,b,c,g	0.01	−0.02 d,o,e,f,b,c,g	−0.01	0.04 d,o,e,f,b,c,g	0.04	−0.00 o,e,f,b,c,g
N1 amplitude	113	−0.18#	−0.13 i,g	0.01	0.01 i,g	−0.08	−0.04 i,g	−0.02	0.03 i,g
P3b latency	51	−0.02	−0.07 k,c,b	−0.10	−0.12 k,c,b	−0.03	0.11 k,c,b	0.03	0.06 k,c
P3b amplitude	51	−0.10	−0.06 k,h,d	−0.04	−0.08 k,h,d	−0.04	−0.06 k,d	−0.06	0.09 f
Target condition
N1 latency	99	0.17#	0.29**d,m	0.08	0.08 d,m,f	−0.09	0.02 d,c,l,f	−0.04	0.03 c,l,f
N1 amplitude	99	−0.21*	−0.32**p,k	−0.07	−0.12 p,k,i	−0.11	−0.14 k,n	−0.06	−0.17 p,k
P3b latency	118	−0.07	−0.16#j	0.03	0.05 j,d,a	0.14	0.10 j,d	0.14	0.07 j,a
P3b amplitude	118	0.01	0.10 c,g	−0.09	−0.08 c	0.01	0.08 c,g	0.00	0.08 c,g

Abbreviations: Hg: mercury; PCB 153: polychlorinated biphenyl congener IUPAC 153.

Note. Because N1 has negative voltage, negative (−) associations between contaminants and N1 amplitude mean greater (more negative) amplitude, while positive (+) associations mean reduced (more positive) amplitude; confounding variables included in the final regression analyses:

^achild age

^bchild gender

^ctesting location

^dbreast-feeding status

^ematernal age

^fmaternal binge drinking during pregnancy

^gHollingshead SES score

^hmaternal Raven score

ⁱnumber of trials retained in the averaged waveform

^jhaemoglobin status

^kcord DHA

^lchild DHA

^mchild Se

ⁿtime at testing

^omaternal regular use of marijuana during pregnancy

^pparity

^**p < 0.01;

^*p < 0.05;

^#p < 0.10.