Table 3.

Spearman’s correlation matrix. Data are Spearman correlation coefficients (rho) and p-values.

	Children’s IQ	Maternal IQ	Sex	Age (months)	H/A z-Score	PbB (µg/dL)	MnH (µg/g)	MnTn (µg/g)	Hb (g/dL)
Children’s IQ	1.000	0.413 **	0.008	−0.287 **	0.038	−0.264 **	−0.169 *	−0.018	0.110
		0.000	0.906	0.000	0.591	0.000	0.017	0.807	0.111
Maternal IQ		1.000	0.098	−0.117	0.044	−0.070	−0.216 **	0.016	0.126
			0.198	0.128	0.567	0.367	0.006	0.846	0.102
Sex			1.000	0.007	−0.021	0.088	0.099	0.122	0.020
				0.917	0.760	0.193	0.153	0.087	0.766
Age (months)				1.000	−0.099	0.229 **	0.005	0.133	−0.013
					0.150	0.001	0.946	0.063	0.851
H/A z-score					1.000	−0.164 *	−0.050	0.115	−0.029
						0.019	0.490	0.117	0.677
PbB						1.000	0.185 **	0.244 **	−0.178 **
							0.008	0.001	0.008
MnH							1.000	0.394 **	−0.133
								0.000	0.058
MnTn								1.000	−0.164 *
									0.022
Hb (g/dL)									1.000

** Correlation significant at 0.01 (bilateral) and * Correlation significant at 0.05 (bilateral).