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Table 3 Correlation coefficients between concentrations of mercury in tissues, age and number of amalgam surfaces. a

From: Mercury in human brain, blood, muscle and toenails in relation to exposure: an autopsy study

   I-Hg in blood MeHg in blood I-Hg in occipital cortex MeHg in occipital cortex Hg in occipital cortex Hg in pituitary Hg in thyroid Hg in toenail Hg in abdominal muscle Age Filled surfaces – amalgam
I-Hg in blood Correlation   0.251 -0.026 0.052 0.006 -0.062 -0.039 0.065 -0.045 -0.402 0.432
  Sig. (2-tailed)   0.181 0.891 0.784 0.974 0.744 0.845 0.738 0.815 0.028 0.017
  N   30 30 30 30 30 28 29 30 30 30
MeHg in blood Correlation 0.246   -0.071 0.725 0.232 -0.107 -0.090 0.634 0.230 0.055 -0.126
  Sig. (2-tailed) 0.198   0.710 <0.001 0.218 0.572 0.648 <0.001 0.221 0.774 0.507
  N 29   30 30 30 30 28 29 30 30 30
I-Hg in occipital cortex Correlation 0.253 0.134   0.339 0.927 0.967 0.993 -0.086 -0.155 0.334 0.081
  Sig. (2-tailed) 0.186 0.490   0.067 <0.001 <0.001 <0.001 0.656 0.414 0.071 0.669
  N 29 29   30 30 30 28 29 30 30 30
MeHg in occipital cortex Correlation 0.079 0.804 0.081   0.617 0.287 0.336 0.586 0.258 0.154 -0.136
  Sig. (2-tailed) 0.686 <0.001 0.677   <0.001 0.124 0.081 0.001 0.169 0.416 0.472
  N 29 29 29   30 30 28 29 30 30 30
Hg in Correlation 0.147 0.713 0.604 0.768   0.904 0.910 0.154 -0.048 0.295 0.080
occipital cortex Sig. (2-tailed) 0.447 <0.001 0.001 <0.001   <0.001 <0.001 0.425 0.800 0.113 0.676
  N 29 29 29 29   30 28 29 30 30 30
Hg in pituitary Correlation -0.002 -0.062 0.652 -0.086 0.390   0.953 -0.100 -0.149 0.261 0.173
  Sig. (2-tailed) 0.993 0.748 <0.001 0.659 0.036   <0.001 0.607 0.432 0.163 0.360
  N 29 29 29 29 29   28 29 30 30 30
Hg in thyroid Correlation 0.352 0.142 0.602 0.105 0.396 0.402   -0.087 -0.125 0.351 0.031
  Sig. (2-tailed) 0.072 0.479 0.001 0.603 0.041 0.038   0.667 0.525 0.067 0.875
  N 27 27 27 27 27 27   27 28 28 28
Hg in toenail Correlation 0.060 0.631 -0.093 0.649 0.525 -0.095 -0.091   0.139 0.158 -0.328
  Sig. (2-tailed) 0.760 <0.001 0.638 <0.001 0.004 0.629 0.660   0.472 0.414 0.083
  N 28 28 28 28 28 28 26   29 29 29
Hg in abdominal muscle Correlation -0.055 0.220 -0.079 0.328 0.186 -0.038 0.335 0.130   -0.003 -0.081
  Sig. (2-tailed) 0.778 0.251 0.683 0.083 0.334 0.847 0.088 0.510   0.988 0.672
  N 29 29 29 29 29 29 27 28   30 30
Age Correlation -0.408 0.096 -0.208 0.037 -0.084 -0.287 -0.215 0.200 0.055   -0.610
  Sig. (2-tailed) 0.028 0.621 0.278 0.849 0.664 0.131 0.282 0.308 0.778   <0.001
  N 29 29 29 29 29 29 27 28 29   30
Filled surfaces – amalgam Correlation 0.433 -0.127 0.550 -0.144 0.185 0.541 0.530 -0.328 -0.082 -0.655  
  Sig. (2-tailed) 0.019 0.513 0.002 0.457 0.337 0.002 0.004 0.088 0.673 <0.001  
  N 29 29 29 29 29 29 27 28 29 29  
  1. a The upper part of the table (above the diagonal) shows the correlations using all cases (n = 30) and the lower part (below the diagonal) shows the correlations after exclusion of the case with previous occupational exposure to mercury (dental nurse, see text). P-values and number of cases included in the analysis are given. Significant correlations (p < 0.05) in bold.