Table 6.

B-Pb levels (in μg/dL) in studies on cognitive effects of lead in children

Reference	Subjects #	Study site	Study design	Age (years)	BPb Mean (SD)
Chen et al., 2005	780	Baltimore, MD, USA,	longitudinal	2	26.2 (5.1)
	731	Cincinnati, OH, USA,	longitudinal	5	12.0 (5.2)
	622	Newark, NJ, USA,	longitudinal	7	8.0 (4.0)
		Philadelphia, PA, USA	longitudinal
Canfield et al., 2003	154	Rochester, NY, USA	longitudinal	0.5	3.4
				2	9.7
				5	6.0
Roy et al., 2011	651	Chennai, India	cross-sectional	3–7	11.42 (5.43)
Bellinger et al., 2005	74	Chennai, India	cross-sectional	4–14	11.10 (5.6)
Schnaas et al., 2006	150	Mexico City, Mexico	longitudinal	1–5	9.8
				6–10	6.2
Ahamed et al., 2005	62	Lucknow, India	cross-sectional	4–12	7.47 (3.06)
Despres et al., 2005	110	Nunavik, Canada	cross-sectional	4–6	5.0 (3.7)
Chiodo et al., 2007	506	Detroit, MI, USA	cross-sectional	7	5.0 (3.0)
Pawlas et al., 2012	175	Upper Silesia, Poland	cross-sectional	6–10	4.66 (1.23)
Nicolescu et al., 2010	83	Bucharest and Pantelimon, Romania	cross-sectional	8–12	4.15
This study	299	Brescia, Italy	cross-sectional	11–14	1.71 (0.99)