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Table 5 Mean urinary mercury (μg Hg/g Cr) in people 6 to 79 years of age

From: Dental amalgam and urinary mercury concentrations: a descriptive study

Characteristic Number of amalgam surfaces Number of amalgam surfaces
All 0 Surfaces 1-5 Surfaces 6-10 Surfaces 11-15 Surfaces 16-20 Surfaces 21-25 Surfaces 26-30 Surfaces 31-45 Surfaces 46-65 Surfaces
  Mean 95% CI Mean 95% CI Mean 95% CI Mean 95% CI Mean 95% CI Mean 95% CI Mean 95% CI Mean 95% CI Mean 95% CI Mean 95% CI
All 0.26 0.23-0.30 0.12 0.10-0.16 0.22 0.17-0.28 0.36 0.30-0.44 0.52 0.38-0.71 0.79 0.63-0.99 1.09 0.80-1.49 1.91 1.49-2.46 2.12 E 1.21-3.71 2.45 E 1.31-4.59
Female 0.33 0.29-0.37 0.15 0.12-0.20 0.25 0.20-0.32 0.44 0.35-0.55 0.68 0.49-0.97 0.99 0.78-1.27 1.24 E 0.77-1.99 2.21 E 1.49-3.27 2.78 E 1.75-4.43 F F
Male 0.21 0.18-0.25 0.10 0.08-0.13 0.19 0.14-0.26 0.31 0.24-0.39 0.41 0.28-0.58 0.63 E 0.41-0.97 0.93 0.68-1.27 1.54 1.11-2.13 1.43 E 0.75-2.73 F F
  1. Estimates representative for the Canadian general population (based on weighted data).
  2. Mean = Geometric Mean.
  3. E Interpret with caution (high sampling variability; coefficient of variation 16.6%-33.3%).
  4. F Estimate not provided because of extreme sampling variability or small sample size.