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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 |