Table 5.
BMD and BMLD of lead dust and fume concentrations in lead poisoning and abnormal ZPP.
| Effect Indicator | Types of Airborne Lead | Model | BMD (mg·y/m3) | BMD (mg/m3) | BMDL (mg·y/m3) | BMDL (mg/m3) | χ2-Value | p-Value * |
|---|---|---|---|---|---|---|---|---|
| Lead poisoning | dust | Log-probit | 0.80 | 0.03 | 0.68 | 0.02 | 8.46 | 0.076 |
| fume | Log-logistic | 0.47 | 0.02 | 0.30 | 0.01 | 6.98 | 0.073 | |
| ZPP | dust | Log-probit | 1.62 | 0.05 | 1.30 | 0.04 | 2.39 | 0.665 |
| fume | Log-logistic | 0.65 | 0.02 | 0.44 | 0.02 | 3.06 | 0.383 |
Notes: * p-values were determined from the chi-square test, with the Pearson goodness-of-fit test, to quantify the degree of the difference between predicted dose response with the fitted model and the actual dose response under each circumstance; p > 0.05 indicates that the model is adequately fit the data; Abbreviations: ZPP, erythrocyte zinc protoporphyrin; CP: coproporphyrin; BMD, benchmark dose; BMDL, benchmark dose lower bound.