Table 1:

Dry-weight basis elemental concentrations (μg/kg) in placenta tissue collected from Hamilton County, TN (n=374).

Element	Mean	Standard Deviation	Median	25%	75%	I.Q.R.	Min.	Max.	Detection Limit a	Detection Limit (ug/L)
Al	1080	1990	385.3	120.9	1061	940.1	1.800	1474 0	3.6	0.09
As	43.01	15.03	42.14	33.66	52.79	19.13	1.800	105	3.6	0.09
Ba	91.62	146.0	47.41	26.67	93.08	66.41	1.200	1657	2.4	0.06
Cd	18.54	11.99	15.81	10.40	23.80	13.4	1.200	84.22	2.4	0.06
Co	8.890	12.72	6.600	3.600	9.650	6.05	1.400	158.3	2.8	0.07
Cu	3889	2480	3413	3001	3923	922	1356	2056 0	2	0.05
Fe	5032 00	232800	46350 0	3809 00	5527 00	1718 00	1751 00	1848 00	4.4	0.11
Mn	346.2	228.0	318.2	249.6	401.7	152.1	1.800	1774	3.6	0.09
Ni	111.0	219.5	60.50	23.79	117.5	93.71	1.600	2886	3.2	0.08
Pb	37.97	270.5	12.03	6.680	23.23	16.55	0.600 0	5073	1.2	0.03
Rh	0.390	0.190	0.380	0.220	0.550	0.33	0.060 0	0.780	0.0008	0.00002
Se	1504	383.0	1442	1329	1584	255	566.3	3773	2.4	0.06
Ti	381.7	77.21	380.7	315.4	448.4	133	238.0	532.7	0.0032	0.00008
Zn	5512 0	24120	50180	4587 0	5548 0	9610	1891 0	3325 00	5.6	0.14

^a)Assuming 0.25 g of sample