Table 4.

Multiple regression model with total IQ as dependent variable

	Estimate	Std. Error	T value	Pr(>|t|)
Intercept	82.362	10.538	7.816	<0.0001
ln(B-Pb)	−3.483	1.481	−2.351	0.0194
SES (medium Vs low)	4.790	1.698	2.821	0.0051
SES (high Vs low)	8.826	1.781	4.955	<0.0001
Area* (lower VC Vs Garda)	−2.735	1.938	−1.411	0.1592
Area (mid VC Vs Garda)	2.512	1.602	1.568	0.1180
Area (upper VC Vs Garda)	−4.328	2.663	−1.625	0.1053
Hemoglobin	1.501	0.760	1.975	0.0493
Alcohol (yes Vs no)	−12.698	3.905	−3.252	0.0013

VC Lower ValCamonica, MVC – Mid ValCamonica, UVC – Upper ValCamonica, n.s. – not significant.