Tri-National Comparisons of Maternal Levels of Persistent Organic Pollutants
Bibliographic record
Abstract
ISEE-334 Objective: The North American Commission for Environmental Cooperation (CEC) is sponsoring a Capacity Building Tri-National multicentered study to evaluate exposure to persistent organic pollutants (POPs) in primiparous women. The objective of this paper was to present the POPs levels that have been analyzed thus far. Material and Methods: The CEC project is collecting data from 5 sites in Canada, 10 sites in Mexico, and from 3 ongoing studies in the United States. Data include administration of a dietary questionnaire and collection of predelivery serum samples for analysis of an extensive panel of POPs. The goal is to enroll 30 mothers at each site. In the United States we have also extracted comparable data from the National Health and Nutrition Examination Survey (NHANES). Results: Overall data collection is ongoing. Thus far, the United States has results from 21 Native Alaska women who are currently enrolled in the Maternal Organic Monitoring Study (MOMS) in Alaska and 120 women with information available in NHANES 01-02. Geometric mean (GM) serum levels (per lipid basis) of POPs measured among the women in the MOMs study were as follows: GM (95% CI) for p,p′-DDE = 149 ng/g (115–193), for β-hexachlorocyclohexane = 18 ng/g (13–24), and for trans-nonchlor = 23 ng/g (17–31). The estimates at the 95th percentile for NHANES are as follows: estimate (95% CI) for p,p′-DDE = 632 ng/g (146–9240), for β-hexachlorocyclohexane = 13 ng/g (3–45), and for trans-nonchlor = 16 ng/g (10–47). The values for the remaining analytes are not reported because the proportion of results below the limit of detection was too high to provide a valid estimate. Conclusions: Women from the Alaska MOMs study have levels lower than US national level. Previous research has demonstrated age and foreign birth to contribute to differences in the level of POPs in pregnant women. Our ongoing analysis will evaluate regional similarities and differences among women with first time pregnancies.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.004 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".