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Table 2 Trace element concentrations and their limits of detection in umbilical cord and maternal plasma

From: Assessment of ten trace elements in umbilical cord blood and maternal blood: association with birth weight

Trace element Limit of detection Cord plasma Maternal plasma Cord/maternal ratio (mean ± SD)
Percent <LOD (%) Mean ± SD Median (IQR) Percent <LOD (%) Mean ± SD Median (IQR)
As (nM/L) 20 0 271.1 ± 45.4 266.4 (24.2) 55.6 26.8 ±16.5 19.9 (4.9) 11.8 ± 3.7
Ba (nM/L) 72.99 1.9 3616.6 ± 3728 3801.8 (6530.4) 1.9 2398 ± 2676 92.1 (5346.3) 5.2 ± 23.9
Co (nM/L) 2.54 0 4.90 ± 1.48 3.79 (0.43) 0 10.5 ± 7.38 6.79 (9.08) 0.64 ± 0.34
Cu (µM/L) 0.03 0 4.10 ± 1.34 3.79 (0.43) 0 23 ± 8.11 22.1 (9.6) 0.19 (0.06)
Cr (nM/L) 22.85 0 69.7 ± 16.8 63.7 (25.4) 79.6 29 ± 0.98 28.8 (0) 2.43 ± 0.61
Fe (µM/L) 0.33 0 6 ± 2.23 5.75 (2.9) 1.9 5.10 ± 1.48 5.25 (1.67) 1.54 ± 1.90
Mg (mM/L) 0.16 0 0.62 ± 0.21 0.59 (0.35) 0 0.83 ± 0.18 0.79 (0.25) 0.75 ± 0.23
Mn (nM/L) 27.3 20 61.3 ± 36.3 53 (44.6) 63 31.9 ± 10.7 27.3 (1.56) 1.99 ± 1.38
Se (nM/L) 301.2 0 438.4 ± 78.6 440.1 (105.5) 0 704 ± 199.7 705.9 (201) 1.08 ± 3.02
Zn (µM/L) 0.5 0 10.6 ± 2.35 10.5 (2.64) 0 11.6 ± 2.29 11.6 (2.11) 0.96 ± 0.33
  1. The values are expressed as mean ± SD and median with interquartile range (IQR)
  2. LOD limit of detection
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