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Table 4 Results from linear multiple regression analyses. a

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

Dependent variable Independent variable(s) in the final model Unstandardized Coefficients Standardized Coefficients t Sig. 95 % Confidence Interval for B
   B Std. Error Beta    Lower Bound Upper Bound
a) I-Hg in brain cortex Constant 4.366 0.925   4.720 <0.001 2.468 6.264
  Filled surfaces – amalgam 0.153 0.045 0.550 3.423 0.002 0.061 0.245
b) Total-Hg in pituitary Constant 25.540 36.893   0.692 0.495 -50.158 101.238
  Filled surfaces – amalgam 5.972 1.788 0.541 3.340 0.002 2.304 9.640
c) Total-Hg in thyroid Constant 13.682 3.359   4.073 <0.001 6.763 20.601
  Filled surfaces – amalgam 0.491 0.157 0.530 3.126 0.004 0.168 0.815
d) Total-Hg in toenails Constant 126.115 50.564   2.494 .019 22.180 230.051
  MeHg in blood (μg/L) 58.888 14.190 0.631 4.150 <0.001 29.720 88.056
  1. a Final results from linear multiple regression analyses using number of surfaces filled with amalgam, age, gender, and MeHg in blood as independent variables (all variables entered at the first step, and removed in the following step(s) if the p-value of the variable was ≥0.10) and (a) I-Hg in brain cortex (μg I-Hg/kg) as dependent variable, (b) Total-Hg in pituitary (μg Hg/kg) as dependent variable, (c) Total-Hg in thyroid (μg Hg/kg) as dependent variable and (d) Total-Hg in toenails (μg Hg/kg) as dependent variable. The case with previous occupational exposure to mercury (case 28) was excluded from the regression analyses (see text). N = 29 in model (a) and (b), n = 27 in model (c) and n = 28 in model (d).