Skip to main content
. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: J Expo Sci Environ Epidemiol. 2010 Jun 30;21(4):355–364. doi: 10.1038/jes.2010.19

Table 2.

Estimated element concentrations in NBS samples (ng/spot).

Correction method A1 Correction method B1
Element Median
uncorrected
concentration
(n=150)		 median mean sd Samples
with
detectable
element
(%)		 Median
uncorrected
concentration
(n=15)		 median mean sd Samples
with
detectable
element
(%)		 R2
Al 72.13 −8.13 14.35 59.60 1 61.40 −10.85 −12.02 20.26 0 0.39
Ba 19.89 11.43 11.74 3.62 99 20.03 0.96 0.69 2.62 13 0.51
Ca 13 159.67 6 042.05 6 062.44 2 003.74 83 13 265.95 5 699.21 5 462.04 1 713.48 73 0.85
Cd 0.33 0.24 0.33 0.46 100 0.31 −0.07 −0.15 0.18 0 0.76
Ce 0.37 0.24 0.24 0.16 76 0.41 −0.03 −0.04 0.10 7 0.19
Co 1.43 −0.73 −0.76 0.67 0 1.48 1.31 1.29 0.25 100 0.64
Cr 0.43 0.01 0.05 0.28 3 0.40 −0.16 −0.43 1.03 7 0.45
Cs 0.07 0.06 0.10 0.30 61 0.06 0.03 0.03 0.03 80 0.47
Cu 56.45 48.99 50.63 14.12 100 60.01 46.53 45.45 12.30 100 0.91
Fe 9 317.13 9 237.96 9 797.48 3 481.14 100 11 526.76 11 261.81 10 124.47 3 679.06 100 1.00
K 87 441.07 87 202.97 95 169.20 37 889.52 100 92 189.82 58 085.18 58 665.40 18 807.63 100 0.96
Li 0.53 0.28 13.42 84.72 32 0.78 0.63 35.65 135.66 87 1.00
Mg 4 672.12 2 943.92 3 016.80 666.84 99 5 027.94 3 559.58 3 570.04 803.53 100 0.95
Mn 35.83 19.31 18.53 5.89 97 38.34 0.49 0.33 4.55 0 0.26
Mo 0.20 0.02 0.43 1.66 19 0.56 −0.25 −0.22 0.34 0 0.05
Na 74 889.37 71 689.86 75 469.07 26 607.75 100 80 687.55 51 973.43 52 866.97 15 005.55 100 0.94
Ni 1.27 0.46 1.58 5.98 18 1.65 −0.72 3.37 11.97 13 1.00
P 25 068.88 24 841.72 26 051.10 7 178.15 100 27 198.43 25 971.20 25 773.40 6 260.10 100 0.99
Pb 1.83 0.76 1.33 1.87 10 1.61 0.30 0.88 2.90 27 0.95
Rb 84.83 84.59 96.18 45.31 100 96.30 59.57 57.23 21.04 100 0.96
S 3 644.95 3 011.47 3 169.25 1 446.07 100 3 897.68 2 647.47 2 572.00 602.73 100 0.97
Sb 0.09 0.07 0.11 0.15 9 0.07 −0.09 −0.06 0.23 0 0.70
Sr 18.59 6.65 6.77 2.58 56 19.98 4.58 4.47 2.98 33 0.94
Ti 0.82 −0.46 −0.24 1.23 0 0.62 −1.10 −1.07 1.65 0 0.62
Tl3 6.00 4.20 3.78 3.11 16 6.67 4.72 4.05 2.24 20 0.41
U3 7.75 −0.37 0.15 3.64 2 5.51 −3.53 −3.74 2.58 0 0.40
V 0.16 −0.01 0.00 0.07 1 0.14 −0.01 −0.04 0.11 0 0.37
Zn 213.59 203.26 217.82 91.48 87 226.43 142.16 119.67 121.15 80 0.82
1

Statistics for correction methods A and B are based on 150 and 15 samples respectively.

2

Pearson’s correlation coefficient between NBS element concentrations calculated using method A and B on the same samples (n=15)

3

Expressed in picograms/spot