Table 2.

Pearson correlations among primary study variables.

Variable		1	2	3	4	5	6
1	Childhood Blood-Lead Level	–
2	Maternal Verbal IQ	−0.06	–
3	WISC-R Childhood IQ	−0.03	0.38***	–
4	Childhood Socioeconomic Status	0.03	0.36***	0.41***	–
5	WAIS-IV Age-38 Full-Scale IQ	−0.11*	0.44***	0.76***	0.38***	–
6	Age-38 Socioeconomic Status	−0.11**	0.24***	0.43***	0.35***	0.49***	–

Note. Socioeconomic status was assessed in childhood using the Elley-Irving scale (range 1 lowest – 6 highest) and at age 38 years using the New Zealand Socioeconomic Index-2006, (NZSEI-06; range 10 lowest - 90 highest).

Note.

^*P < .05,

^**P < .01,

^***P < .001.