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Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

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AX4-29<br />

Reference, Study<br />

Location, and<br />

Period Study Description<br />

Mexico (cont’d)<br />

Moline et al. (2000)<br />

Morelos, Mexico<br />

1999<br />

PbB = blood lead.<br />

Table AX4-7 (cont’d). Bone <strong>Lead</strong> Studies in Pregnant and Lactating Subjects<br />

Pilot study to assess the body<br />

burden <strong>of</strong> lead in 24 Mexican<br />

women (age 21-34 yr) who were<br />

lactating. Demographic and<br />

reproductive characteristics <strong>of</strong><br />

women and potential sources <strong>of</strong><br />

lead exposure were gathered by a<br />

direct interview. Multiple<br />

regression. Average time <strong>of</strong><br />

lactation 22 (±17) months.<br />

<strong>Lead</strong> Measurement (SD or range)<br />

PbB in µg/dL, Bone Pb in µg/g Bone Mineral Findings, Interpretation<br />

PbB 4.6 (± 2.0, geometric mean), tibia 9.2 (±4.2), patella 14.8 (±8.0),<br />

calcaneus 11.7 (±11.2). An inverse relationship was noted between months<br />

<strong>of</strong> lactation and age-adjusted calcaneus lead level (p = 0.001).<br />

No association was observed between age-adjusted patella or tibia lead level<br />

and months <strong>of</strong> lactation (p = 0.15).<br />

This pilot study provides further<br />

limited evidence <strong>for</strong> the<br />

hypothesis that Pb mobilization<br />

occurs during lactation.

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