| Blood Lead Slope Factor Models for Adults: Comparisons of Observations and Predictions |

| | The **geometric** **standard** **deviation** (the antilog of the arithmetic **standard** **deviation** of the log-transformed data) is a measure of the range, or spread, in PbB levels for a group of people. |

| | To account for the tendency for site-specific **geometric** **standard** **deviations** to be smaller than **geometric** **standard** **deviations** for populations living over a broad geographic area, we assume that values from 1.7 to 1.9 are a reasonable range for the **GSD** for women of childbearing age. |

| | Table 9 considers alternative assumptions for several parameters, including: the **geometric** **standard** **deviation**, exposure frequency, the possibility that some fraction of soil ingested is comprised of dust, the soil ingestion rate, and the fraction of soluble lead that is absorbed. |

| ehp.niehs.nih.gov /members/1998/Suppl-6/1569-1576bowers/bowers-full.html (6274 words) |