Table 6.
Pb-to-Cd molar ratios (Pb/Cd) for hair, teeth, and blood in the present and other studies
| Sample | Present study | Other studies | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Site | GM | Median | N | SDg | Environment | Pb/Cd | Age or type | Reference | |
| Hair | U | 8.5 | 8.5 | 63 | 2.17 | U; R (Germany) | 11.5 | 6–18 | [7] |
| NU | 7.1 | 7.5 | 83 | 2.23 | |||||
| p = 0.19 | |||||||||
| Teeth | U | 25 | 24 | 89 | 2.07 | U; R (Finland) | 15 | primary teeth | [69] |
| NU | 35 | 36 | 88 | 2.12 | |||||
| p = 0.002 | |||||||||
| Blood | U | 68 | 65 | 88 | 1.92 | U; R (Germany) | U 125;R 68 | 6–18; adults | [7] |
| NU | 83 | 78 | 94 | 2.08 | F; M (Krakow) | F 74; M 91 | 11 | [58] | |
| p = 0.06 | |||||||||
GM geometric mean, N number of cases, SDg geometric standard deviation, p level from t test for independent samples, H hair, T teeth, B blood; M male, F female; U urban; NU non-urban, R rural