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Table 4 Mean urinary mercury concentrations (μg Hg/L) 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 0.22 0.19-0.25 0.10 0.08-0.12 0.19 0.14-0.25 0.31 0.26-0.38 0.39 E 0.26-0.58 0.65 0.50-0.85 0.84 E 0.56-1.27 1.78 E 1.23-2.58 1.92 E 1.00-3.69 F F
Female 0.22 0.19-0.25 0.10 0.08-0.12 0.18 0.14-0.23 0.28 0.22-0.36 0.42 E 0.26-0.68 0.74 0.53-1.03 0.72 E 0.35-1.47 1.58 E 0.93-2.69 2.16 E 1.13-4.14 F F
Male 0.22 0.19-0.25 0.10 0.08-0.12 0.20 E 0.13-0.30 0.35 0.27-0.45 0.37 E 0.24-0.56 0.58 E 0.35-0.95 1.03 E 0.68-1.56 2.13 E 1.39-3.28 F F 2.55 E 1.45-4.47
  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.